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‘C’ Programming
Implement strcpy() function.
Question No : 1
Method1:
Answer
char *mystrcpy(char *dst, const char *src)
{
char *ptr;
ptr = dst;
while(*dst++=*src++);
return(ptr);
}
The strcpy function copies src, including the
terminating null character, to the
location specified by dst.
No overflow checking is performed when strings are
copied or appended.
The behavior of strcpy is undefined if the source and
destination strings overlap.
It returns the destination string.
No return value is reserved to indicate an error.
Answer
The prototype of strcpy as per the C standards is
char *strcpy(char *dst, const char *src);
const for the source, signifies that
the function must not change the
source string
Answer
Method2:
char *my_strcpy(char dest[], const char source[])
{
int i = 0;
while (source[i] != '\0')
{
dest[i] = source[i];
i++;
}
dest[i] = '\0';
return(dest);
}
Answer
Write C programs to implement the toupper() and
the isupper() functions
Question No : 2
toUpper() isUpper()
int toUpper(int ch)
{
if(ch>='a' && ch<='z')
return('A' + ch - 'a');
else
return(ch);
}
int isUpper(int ch)
{
if(ch>='A' && ch <='Z')
return(1); //Yes, its
upper!
else
return(0); // No, its
lower!
}
A-Z - 65-90
a-z - 97-122
Answer
Write a C program to swap two variables without
using a temporary variable
Question No : 3
Answer
Method1: (The XOR)
a ^= b ^= a ^= b;
Method2: (The XOR)
a=a+b;
b=a-b;
a=a-b;
When should a typecast be used?
Question No : 4
Answer
There are two situations in which to use a type cast.
The first use is to change the type of an operand to an
arithmetic operation so that the operation will be performed
properly.
The second case is to cast pointer types to and from void *
in order to interface with functions that expect or return
void pointers.
struct foo *p = (struct foo *) malloc(sizeof(struct foo));
What do lvalue and rvalue mean?
Question No : 5
Answer
An lvalue is an expression that could appear on
the left-hand sign of an assignment (An object
that has a location).
An rvalue is any expression that has a value (and
that can appear on the right-hand sign of an
assignment).
What is the difference between & and &&
operators and | and || operators?
Question No : 6
& and | are bitwise AND and OR operators
respectively. They are usually used to manipulate
the contents of a variable on the bit level.
&& and || are logical AND and OR operators
respectively. They are usually used in
conditionals.
Answer
What is sizeof()?
a. Function
b. Operator
Question No : 7
a. Function
b. Operator
sizeof() is a compile time operator.
To calculate the size of an object, we need the
type information.
Answer
How to declare a pointer to a function?
Question No : 8
Answer
int myfunc(); // The function.
int (*fp)(); // Pointer to that function.
fp = myfunc; // Assigning the address of
the function to the pointer.
(*fp)(); // Calling the function.
fp(); // Another way to call the
function.
What are the common causes of pointer bugs?
Question No : 9
Answer
Uninitialized pointers:
One of the easiest ways to create a pointer bug is to try
to reference the value of a pointer even though the
pointer is uninitialized and does not yet point to a valid
address.
For example: int *p;
*p = 12;
The pointer p is uninitialized and points to a random location
in memory when you declare it.
It could be pointing into the system stack, or the global
variables, or into the program's code space, or into the
operating system.
When you say *p=12;, the program will simply try to write a
12 to whatever random location p points to.
Make sure you initialize all pointers to a valid address before
dereferencing them.
Answer
Invalid Pointer References:
An invalid pointer reference occurs when a pointer's value is
referenced even though the pointer doesn't point to a valid
block.
One way to create this error is to say p=q; when q is
uninitialized. The pointer p will then become uninitialized as
well, and any reference to *p is an invalid pointer reference.
The only way to avoid this bug is to draw pictures of each
step of the program and make sure that all pointers point
somewhere.
Answer
Zero Pointer Reference:
A zero pointer reference occurs whenever a pointer pointing to
zero is used in a statement that attempts to reference a block.
For example, if p is a pointer to an integer, the following code is
invalid:
There is no block pointed to by p. Therefore, trying to read or
write anything from or to that block is an invalid zero pointer
reference.
p = 0;*p = 12;
Answer
How to declare an array of N pointers to functions
returning pointers to functions returning pointers
to characters?
Question No : 10
Declare it this way
Answer
char *(*(*a[N])())();
Will C allow passing more or less arguments than
required to a function?
Question No : 11
It will not allow if the prototype is around.
It will ideally throw an error like Too many
arguments or Too few arguments
But if the prototype is not around, the behavior is
undefined.
Answer
Try this out
#include <stdio.h>
int foo(int a);
int foo2(int a, int b);
int main(int a)
{
int (*fp)(int a);
a = foo();
a = foo2(1);
exit(0);
}
int foo(int a)
{
return(a);
}
int foo2(int a, int b)
{
return(a+b);
}
Answer
What does printf() return?
Question No : 12
Upon a successful return, the printf() function returns the number
of characters printed (not including the trailing '\0' used to end
output to strings).
If the output was truncated due to this limit then the return
value is the number of characters (not including the trailing
'\0') which would have been written to the final string if
enough space had been available.
Thus, a return value of size or more means that the output
was truncated. If an output error is encountered, a negative
value is returned.
Answer
Look at the code below.
What should X be replaced with inorder to get the
output as "Hello World"?
Question No : 13
void main()
{
if(X) {
printf("Hello");
}
else {
printf(" World");}
}
Answer
#include <stdio.h>
int main()
{
if(!printf("Hello")) {
printf("Hello");
}
else {
printf(" World");
}
}
Write a C program to count bits set in an integer.
Question No : 14
Answer
#include <stdio.h>
int CountSetBits(int n)
{
int count = 0;
while(n) {
n &= (n-1);
++count;
}
return count;
}
int main(void)
{
int n;scanf("%d",&n);
printf("Number of set
bits in %d is %d \n",
n, CountSetBits(n));
return 0;
}
Write a C Program to calculate pow(x,n)
Question No : 15
Answer
int pow(int x, int y) {
if(y == 1) return x ;
return x * pow(x, y-1) ;
}
Divide and Conquer C program
#include <stdio.h>
int main(int argc,
char*argv[]) {
printf("\n[%d]\n",pow(5,4));
}
printf("\n[%d]\n",pow(5,4));
}
int pow(int x, int n)
{ if(n==0)return(1);
else if(n%2==0) {
return(pow(x,n/2)*pow(x,(n/2)));
}
else {
return(x*pow(x,n/2)*pow(x,(n/2))
);
}
}
Also, the code above can be optimized still by calculating
pow(z, (n/2)) only one time (instead of twice) and using its
value in the two return() expressions above.
Answer
Write a code to return a string from a function
Question No : 16
Answer
char *myfunc()
{
char *temp = "string";
return temp;
}
int main()
{
puts(myfunc ());
}
Write code to evaluate a polynomial.
Question No : 17
Answer
typedef struct node
{
float cf;
float px;
float py;
struct node *next;
}mynode;
float evaluate(mynode *head)
{
float x,y,sum;
sum = 0;
mynode *poly;
for(poly = head->next; poly !=
head; poly = poly->next)
{
sum = sum + poly->cf * pow(x,
poly->px) * pow(y, poly->py);
}
return(sum);
}
Write a C program to convert from decimal to any
base (binary, hex)
Question No : 18
Answer
#include <stdio.h>
#include <conio.h>
void decimal_to_anybase(int,int);
void main() {
decimal_to_anybase(10, 2);
decimal_to_anybase(255, 16);
getch();
}
void decimal_to_anybase(int n, int base) {
int i, m, digits[1000], flag;
i=0;
printf("\n\n[%d] converted to base [%d] : ", n, base);
Answer
while(n) {
m=n%base;
digits[i]="0123456789abcdefghijklmnopqrstuvwxyz"[m];
n=n/base;
i++;
}
//Eliminate any leading zeroes
for(i--;i>=0;i--) {
if(!flag && digits[i]!='0')flag=1;
if(flag)printf("%c",digits[i]);
}
}
How to fast multiply a number by 7?
Question No : 19
(num<<3 - num)
Same as, num*8 - num = num * (8-1) = num * 7
Answer
How can we sum the digits of a given number in
single statement?
Question No : 20
Answer
# include<stdio.h>
void main()
{
int num=123456;
int sum=0;
for(;num>0;sum+=num%10,num/=10); // This is
the "single line".
printf("\nsum = [%d]\n", sum);
}
Given two strings A and B, how would you find
out if the characters in B were a subset of the
characters in A?
Question No : 21
Answer
#include <stdio.h>
#include <conio.h>
int isSubset(char *a, char *b);
int main(){
char str1[]="defabc";
char str2[]="abcfed";
if(isSubset(str1, str2)==0){
printf("\nYes, characters in B=[%s] are a subset of characters in
A=[%s]\n",str2,str1); }
else {
printf("\nNo, characters in B=[%s] are not a subset of characters
in A=[%s]\n",str2,str1); }
getch();
return(0); }
Answer
// Function to check if characters in "b" are a subset
// of the characters in "a“
int isSubset(char *a, char *b) {
int letterPresent[256];
int i;
for(i=0; i<256; i++)
letterPresent[i]=0;
for(i=0; a[i]!='\0'; i++)
letterPresent[a[i]]++;
for(i=0; b[i]!='\0'; i++)
if(!letterPresent[b[i]])
return(1);
return(0);
}
Write a program to print numbers from 1 to 100
without using loops!
Question No : 22
Answer
void printUp(int startNumber, int endNumber)
{
if (startNumber > endNumber)
return;
printf("[%d]\n", startNumber++);
printUp(startNumber, endNumber);
}
Write code to round numbers
Question No : 23
(int)(num < 0 ? (num - 0.5) : (num + 0.5))
Answer
How to swap the two nibbles in a byte?
Question No : 24
Answer
#include <stdio.h>
unsigned char swap_nibbles(unsigned char c) {
unsigned char temp1, temp2;
temp1 = c & 0x0F;
temp2 = c & 0xF0;
temp1=temp1 << 4;
temp2=temp2 >> 4;
return(temp2|temp1); //adding the bits }
int main(void) {
char ch=0x34;
printf("\nThe exchanged value is
%x",swap_nibbles(ch));
return 0;
}
Write a C program to reverse the words in a
sentence in place.
Like,
Input: I am a good girl
Output: should be: lrig doog a ma I
Question No : 25
Answer
#include <stdio.h>
void rev(char *l, char *r);
int main(int argc, char *argv[]){
char buf[] = "the world will go on forever";
char *end, *x, *y;
// Reverse the whole sentence first..
for(end=buf; *end; end++);
rev(buf,end-1);
First reverse the whole string and then
individually reverse the words
Answer
// Now swap each word within sentence...
x = buf-1;
y = buf;
while(x++ < end)
{
if(*x == '\0' || *x == ' ')
{
rev(y,x-1);
y = x+1;}
}
Answer
// Now print the final string....
printf("%s\n",buf);
return(0); }
// Function to reverse a string in place...
void rev(char *l,char *r) {
char t;while(l<r) {
t = *l;
*l++ = *r;
*r-- = t;
} }
Write a C program to multiply two matrices.
Question No : 26
Answer
// Matrix A (m*n)
// Matrix B (n*k)
// Matrix C (m*k)
for(i=0; i<m; i++) {
for(j=0;j<k;j++) {
c[i][j]=0;
for(l=0;l<n;l++)
c[i][j] += a[i][l] * b[l]
[j];
}
}
Is there something we can do in C but not in C+
+?
Declare variable names that are keywords in C++
but not C.
Question No : 27
Answer
#include <stdio.h>
int main(void)
{
int old, new=3;return 0;
}
This will compile in C, but not in C++!
Write a C program for calculating the factorial of
a number (use recursive function)
Question No : 28
Here is a recursive C program
Answer
int fact(int n)
{
int fact;
if(n==1)
return(1);
else
fact = n * fact(n-1);
return(fact);
} Please note that there is
no error handling added to
this function
Too much error handling and standard compliance results
in a lot of clutter making it difficult to concentrate on the
crux of the solution.
You must of course add as much error handling and
comply to the standards of your compiler when you
actually write the code to implement these algorithms.
Answer
If a character string is to be received through the
keyboard which function would work faster?
a. gets
b. scanf
Question No : 29
a. gets
Answer
Consider the following piece of code and predict the output
a. 100
b. 4
c. 2
d. 99
Question No : 30
void main() {
int i=100;
clrscr();
printf("%d",
sizeof(sizeof(i)));
getch();
}
c. 2
Answer
Choose the correct output from the following
code snippet.
a. It prints "God is Great“
b. Run time error
c. Compilation error
d. No output
void main() {
static int a,b;
if(a & b)
printf("\nGod is Great"); }
Question No : 31
d. No Output
Answer
Which of the following header file is required for
strcpy () function?
a. string.h
b. strings.h
c. stdio.h
d. file.h
Question No : 32
a. string.h
Answer
Choose the correct answer
a. Main cannot be printed
b. %p is an invalid control string
c. Some address will be printed
d. Compile time error
Question No : 33
main()
{
Printf(“%p”,main);
}
c. Some address will be printed
Answer
What error will the below function give on
compilation?
a. The function should be defined as int f(int a, int b)
b. Redeclaration of a
c. Missing parentheses in return
Question No : 34
f(int a, int b)
{
int a;
a = 20;
return a;
}
b. Redeclaration of a
Answer
Choose the correct output for the below code
a. 123,201
b. 121,200
c. 120,201
d. 120,199
Question No : 35
main()
{
int x=45,y=78;
clrscr();
x = y-- + x--;
y = ++y + ++x;
printf ("%d %d\n", x, y);
}
a. 123,201
Answer
Consider the code snippet and choose the correct
output
a. 0
b. No Output
c. Null
d. 1
Question No : 36
void main() {
static int i;
i = i+1;
printf("%d", i);
getch();
}
d. 1
Answer
What is the output of the below code?
Question No : 37
main()
{
int a=10,*j;
void *k;
j=k=&a;
j++;
k++;
printf("\n %u %u ",j,k);
}
Compiler error: Cannot increment a void pointer
Explanation:
Void pointers are generic pointers and they can be used
only when the type is not known and as an intermediate
address storage type.
No pointer arithmetic can be done on it and you cannot
apply indirection operator (*) on void pointers
Answer
What is the output of the below code?
Question No : 38
main()
{
float i = 1.5;
switch(i)
{
case 1: printf(“1”);
case 2: printf(“2”);
default: printf(“0”);
}}
Compiler Error: switch expression not integral
Explanation:
Switch statements can be applied only to integral types.
Answer
What is the output of the below code?
Question No : 39
void main()
{
static int i;
while(i<=10)
(i>2)?i++:i--;
printf(“%d”, i);
}
32767
Explanation:
Since i is static it is initialized to 0. Inside the while loop
the conditional operator evaluates to false, executing i--.
This continues till the integer value rotates to positive
value (32767). The while condition becomes false and
hence, comes out of the while loop, printing the i value.
Answer
What is the output of the below code?
Question No : 40
main()
{
char str1[] = ”some”;
char str2[] =”some”;
if (strcmp(str1,str2))
printf(“Strings are not
equal\n”);
}
No output
Answer
What is the output of the below code?
Question No : 41
main()
{
char p[ ]="%d\n";
p[1] = 'c';
printf(p,65);
}
A
Explanation:
Due to the assignment p[1] = ‘c’ the string becomes,
“%c\n”.
Since this string becomes the format string for printf and
ASCII value of 65 is ‘A’, the same gets printed.
Answer
What is the output of the below code?
Question No : 42
void main()
{
int i=5;
printf(“%d”,i=++i ==6);
}
1
Explanation:
The expression can be treated as i = (++i==6), because
== is of higher precedence than = operator.
In the inner expression, ++i is equal to 6 yielding true
(1). Hence the result.
Answer
What is the output of the following code?
Question No : 43
main()
{
int a[5] = {2,3};
printf(" "\n%d %d d"",a[2],a[3],a[4]);
}
0 0 0
Answer
What will be the output of the below program?
a. 4
b. 3
c. No output
d. 0
Question No : 44
#include<stdio.h>
#define MIN(x,y)(x<y)?
x:y
void main() {
int x = 3, y = 4,z;
z = MIN(x+y/2,y-1);
if(z>0)
printf("%d",z);
}
b. 3
Answer
Which of the following is correct about the
statement given below?
a. structure engine is nested within structure maruti
b. structure maruti is nested within structure engine
c. structure maruti is nested within structure bolts
d. structure engine is nested within structure engine
Question No : 45
maruti.engine.bolts = 25;
a. structure engine is nested within structure
maruti
Answer
Which of the following is the correct output for the
program given below?
a. 1
b. 2
c. 5
d. 4
Question No : 46
int fun(int);
void main(){
int i = 3;
fun(i = fun(fun(i)));
printf("%d",i);
}
fun(int i){
i++;
return(i);
}
c. 5
Answer
Recursions works slower than loops
a. True
b. False
Question No : 47
a. True
Answer
Choose the correct answer based on output from
following piece of code
a. 16, 25
b. 9,49
c. Error in code
d. 6,7
Question No : 48
#define PRODUCT(x) (x*x)
main()
{
int i = 3,j,k;
j = PRODUCT (i++);
k = PRODUCT(++i);
printf(“\n%d %d”, j,k);
}
b. 9,49
Answer
Which of the following is the correct output for
the given program?
a. d
b. Abcdefgh
c. e
d. Compile time error
Question No : 49
void main()
{
printf("%c","abcdefgh"[4]);
}
c. e
Answer
Which of the following is the correct output for
the program given below?
a. 20
b. 10
c. 30
d. 0
Question No : 50
#include<stdio.h>
void main() {
union var {
int a, b;
};
union var v;
v.a = 10;
v.b = 20;
printf("%d",v.a); }
a. 20
Answer
On opening a file for reading which of the
following activities are performed?
a. A pointer is set up which points to the first character in
the file
b. The disk is searched for existence of the file
c. The file is brought into memory
Question No : 51
a, b and c
Answer
The assignment operation X=Y means?
a. l-value of Y is stored in l-value of X
b. r-value of Y is stored in r- value of X
c. r-value of Y is stored in l-value of X
d. l-value of Y is stored in r-value of X
Question No : 52
c. r-value of Y is stored in l-value of X
Answer
Which of the following statement is/are true?
i. A char data type variable always occupies one byte
independent of the system architecture.
ii. The sizeof operator is used to determine the amount of
memory occupied by a variable.
a. Only i
b. Only ii
c. Both i & ii
d. Neither i nor ii
Question No : 53
b. Only ii
Answer
Write down the equivalent pointer expression for
referring element a[i][j][k][l] ?
Question No : 54
Hence Final output is *(*(*(*(a+i)+j)+k)+l)
Answer
a[i] == *(a+i)
a[i][j] == *(*(a+i)+j)
a[i][j][k] == *(*(*(a+i)+j)+k)
a[i][j][k][l] == *(*(*(*(a+i)
+j)+k)+l)
The preprocessor can trap the simple errors like
missing declarations, nested comments or
mismatch of braces.
a. True
b. False
Question No : 55
b. False
Answer
What is the output of the below code?
a. Syntax Error
b. No Output
c. Compiler Error
d. hello
Question No : 56
#include main(){
struct xx {
int x=3;
char name[]=”hello”;
};
struct xx *s;
c. Compiler Error
Answer
What is the output of the below code?
a. H
b. Syntax error
c. Compiler error
d. E
Question No : 57
void main()
{
char *p;
p=”Hello”;
printf(“%c\n”,*&*p);
}
a. H
Answer
In the following code
fp points to
a. A Structure which contains a char pointer which points to the first character
in the file
b. The name of the file
c. The First character in the file
Question No : 58
#include<stdio.h>
main() {
FILE *fp;
fp=fopen("trail","r");
}
a. A Structure which contains a char pointer which
points to the first character in the file
Answer
what will scanf do ?
a. Compiler error
b. terminates reading input into variable line after newline
c. terminates reading input into variable line after entering ^n
Question No : 59
#include<stdio.h>
main()
{
char line[80];
scanf("%[^n]",line);
printf("%s",line);
}
b. Terminates reading input into variable line after
newline
Answer
What is the output of the below code?
Question No : 60
void main()
{
char s[ ]="Welcome";
int i;
for(i=0;s[ i ];i++)
printf("\n%c%c%c%c",s[ i ],*(s+i),*(i+s),i[s]);
}
WWWWeeee
llll
cccc
oooo
mmmm
eeee
Answer
Explanation:
s[i], *(i+s), *(s+i), i[s] are all different ways of expressing
the same idea.
Generally array name is the base address for that array.
Here s is the base address.
i is the index number/displacement from the base
address.
So, indirecting it with * is same as s[i]. i[s] may be
surprising. But in the case of C it is same as s[i].
Answer
What does the following program do?
Question No : 50
#include "math.h"
main(){
int n,i,j,m;
printf("Enter any number \n");
scanf("%d", &n);
for(i=1;i<=n;i++) {
m=(int)(sqrt(i));
for(j=1; j<=m;j++)
if(func(i,j)!=1)
break;
if(j==m+1)
printf("%d\t", i);
}
}
int func(int u, int v){
int min,i,val;
min = (u<v?u:v);
for(i=1;i<min;i++)
if(u%i==0&&v%i==0)
val = i;
return(val);
}
It will print the list of all primary numbers less
than or equal to a given number n
Answer
You have given 1000 integers to sort. But, your
RAM accommodates maximum of 100 integers
only. How do your sort them?
Question No : 62
We have to use external sorting (by tapes, disks
etc.) mechanism.
We can use merge sort for internal sorting
iterations.
Answer
How to allocate and deallocate memory for
char** ?
Question No : 63
Answer
char** pp = new char*[10];
for(int i=0;i<10;i++)
char*[i]=new char[100];
Allocation
In the order, first construct
the main objects, and then
construct the internal
objects
for(int i=0;i<10;i++)
delete [] char*[i];
delete[] pp;
Deallocation
In the reverse order, first
destruct the internal objects,
then destruct the main
object
Answer
What are the best data structures for insertion,
deletion and search operations?
Question No : 64
For Insertion and deletion - Linked list
For search - Map (it is a height balanced Red-
black tree. We can search in O(log n))
Answer
Describe two scenarios where an application will
crash due to stack overflow.
Question No : 65
The two most common causes for a stack
overflow is:(i) An infinite recursion
Answer
int f1(){
f2();
}
int f2() {
f1();
} f1() calls f2(), which in turn
calls f1() and so on.
Eventually, the stack
overflows.
(ii) An attempt to create a large array on the stack,
for example:int main()
{
int a[100000000]; // array is too
large
int b =0; //b's address exceeds the
stack's limits, error
}If our program crashes due to a
stack overflow, we need to
check for infinite recursion or
too large local objects
Answer
Can main function be overloaded? Explain.
Question No : 66
No, only one type of calling is allowed in a
program (with out arguments/with two
arguments/ with three arguments)
Answer
How to count the number of set bits of an integer
using that many number of iterations of for loop?
Question No : 67
Answer
unsigned int v; // count the number of bits
set in v
unsigned int c; // c accumulates the total
bits set in v
for (c = 0; v; c++)
{
v &= v - 1; // clear the least significant
bit set
}
What is the output of this program?
Question No : 68
#include <stdio.h>
void main() {
char s[20];
char *str = "Sachin Tendulker";
sscanf(str, "%s", s);
printf("%s", s);
sscanf(str+7, "%[duenTlk]", s);
printf("%s", s);
sscanf(str+15, "%[^Ganguly]", s);
printf("%s\n", s); }
SachinTendulker
Explanation:
The above statement captures Sachin only into S, because of white space
character.
The above statement captures Tendulker into S freshly. Because the format
specifier has wildcard character [duenTlk], which means the scanning of
string would be done as long as the character is one among the list of
characters(starting from str+7).
when it encounters a new character which is not there in the list the
reading stops.
sscanf(str, "%s", s);
sscanf(str+7, "%[duenTlk]", s);
The above statement captures r into S freshly. Because
the format specifier has wildcard character [^Ganguly],
which means the scanning of string would be done as
long as the character is not one among the list of
characters(starting from str+15).
when it encounters a new character which is there in the
list(or when the null character occurs) the reading stops.
Answer
sscanf(str+15, "%[^Ganguly]", s);
What is the output of the following program?
Question No :69
main() {
union abc {
int a:1;
int b:1;
int c:1;
int d:1;
int e:1;
int f:1;
int g:1;
int h:1;
};
abc X;
abc.a = abc.b = abc.c
= abc.d = abc.e =
abc.f =abc.g = abc.h =
1;
printf("%d",X);
}
-1
Explanation:
By default, X is signed and has sign bit 1. Therefore, it is
stored in 2’s complement form.
Answer
Consider the following code:
What is the scope difference between i and j?
Question No : 70
int i;
static int j;
main( )
{
}
Both i and j have global scope, but j cannot be
accessed in the other modules(files)
Answer
How many times the following program would
print India?
Question No : 71
main( )
{
printf(" \n India");
main();
}
Till stack does not overflow (Infinite loop)
Answer
What is heap?
Question No : 72
The heap is where malloc(), calloc(), and realloc() get memory.
Getting memory from the heap is much slower than getting it
from the stack.
On the other hand, the heap is much more flexible than the
stack. Memory can be allocated at any time and deallocated in
any order.
Such memory is not deallocated automatically; you have to
call free().
Recursive data structures are almost always implemented with
memory from the heap.
Answer
What would be the output of the following
program if the array begins at the location
65472?
Question No : 73
main( ) {
int a[3][4] = {
1,2,3, 4,
4,3,2,1,
7,8,9,0
};
printf( "\n %u %u ",a+1, &a+1);
}
65488, 65520
Answer
Provide simple implementation of int atoi(char*
pStr)
Question No : 74
Answer
int atoi(char* pStr) {
int iRetVal=0;
if (pStr){
while (*pStr && *pStr<= ‘9’ && *pStr>=’0’)
{
iRetval = (iRetval*10) + (*pStr – ‘0’);
pStr++;
}
}
return iRetval;
}
What is the output of the below statement?
Question No : 75
printf(“%d”);
Garbage Value.
Because, when we write printf("%d",x); this means
compiler will print the value of x.
But as here, there is nothing after %d so garbage value is
given as an output.
Answer
