HOLIDAY HOMEWORK COMPUTER SCIENCE CLASS - XI

1. Write the name of the header files to which the following built – in functions belong:i) exit(0) ii) clrscr( ) iii) setw() iv ) sqrt () v) getch()

2. Find the output of the following program:

#include<iostream.h>void main( ){        long NUM = 1234543;          int F = 10, S = 20;       int Rem = NUM% 10;          if (Rem % 2 !=0)                F+ =R;         else                S+ = R;        NUM/=10; cout<<F-S; }

3. What will be the output of the following code fragment . Justify your answer ? int f = 1 , a = 2 ;

if ( + + a < 5 ){

f * = a ; } cout << “ f = “ << f ;

4. int a =11 , b = 20 , c = 40;a = - - c + ++ b / c ;cout << “ a = “ << a ;

5. Rewrite the following statements in terms of switch-case statement char code; cin>> code; if ( code == ‘R’ ) cout << “ Rs. 4 “;

else if (code == ‘W’  || code == ‘G’ ) cout << “ Rs . 10 “;else cout << “ Rs . 12 “;

6. Write the output if the statements are executed thricevar1= 1; var2 = 11;

{ cout << var1++ << “ “ << -- var2 << “\n “ ;

cout << var2-- << “ “ << var1++ << “\n” ;}

7) What is the difference b/w instruction , program and software? 8) (i) Storage of 1 KB means the following number of bytes : 1) 1000 2) 964 3) 1042 4) 1024

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9) State the basic units of the computer, Name the subunits that make up the CPU and give the function of each of the units.

II 1) What is the difference b/w if – else - if and switch - case

2) What are data types? What are all predefined data types in c++? 3) Write the corresponding C++ expressions for the following mathematical expressions:

i) √ (a2+b2+c2) (ii) p+q/(r+s) 4

4) Evaluate the following, where a, b, c are integers and d, f are floating point numbers. The value of a=8, b=4 and d=2.5

(i) f = a * b + a/b(ii) c = d+a + b % a

5) Write the output 1) # include<iostream.h> void main( ) { a=3; a=a+1; if (a>5) cout<<a; else cout<<(a+5);

} 2) What will be the output of the following program segment? If input is as: (a) c (b) m (c) a (d) v cin >>ch; switch (ch) { case ‘c’: cout<<”Computer Science”; case ‘m’: cout<<”Mathematics”; break; case ‘a’: cout<<”Accoutant”; break; default: cout<<” wrong choice”; }

3) What output will be the following code fragment produce? void main( )

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{ int val, res, n=1000;

cin>>val; res = n+val >1750 ? 400:200; cout<<res; } (i) if val=2000 (ii) if val=1000 (iii) if val=500

4) Convert the following code segment into switch case construct.

int ch;cin>>ch;If(ch = = 1){ cout<<“ Laptop”;

} else If(ch = = 2)

{cout<<“Desktop ”;

} else if(ch= = 3) { cout<<“Notebook”; } else { cout<<“Invalid Choice”;

}}

}

5) Given the following code fragment int ch=65; cout << ++ch<< “\n”<<ch<<”\n”;

i) What output does the above code fragment produce?ii) What is the effect of replacing ++ ch with ch+1?

6) Evaluate: i) (120)10 = ( X)2

ii) (110001)2=(X)10

iii) (0100011)2=(X)10

iv) (97)10=(X)2

III 1) Write a C++ program to check a year for leap year or not.

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. 2) Write a C++ program to print day of the week corresponding to the number (1-7) entered using switch case statement. 3) Write a C++ program to design a menu for calculator and calculate the following operations :

1 for addition,2 for subtraction,3 for multiplication, 4 for division, 5 for exit the program.

4 Explain the following term:

i) Variable ii) Token iii) comment iv) Keyword

5) Convert the following hex numbers to decimal i) E9 ii) 7 CA3

6) convert the following number to decimal 111011 . 11117) Write a program that reads the units in feets and converts into its equivalent meter and centimeter.

8) Write a program to enter the marks in 5 subjects and calculate the percentage obtained

9) . Write a program to find the smallest of any given three numbers without using logical and operator

10). What is the role of compiler apart from pointing out errors.

11. What does C++ have data type modifiers ?

12. An electricity board charges according to following rates For the first 100 units - 40 P per unitFor the next 200 units - 50 P per unitBeyond 300 units - 60 P per unitAll users are charged meter charge also which is Rs. 50 / - .

13. Evaluate the following C++ expression where a , b, c are integers and d, f, are floating point numbers . The value of a= 5 , b = 3, and d = 15

a) . f = a + b /a

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b) c = d * a +bc) c = (a++) * d + ad) f = ( ++b) * b - ae) c = a – (b++) * (--a)

14. Write a program to input any alphabet ( lower case / upper case ) from the keyboard and then display one of the following messages i) If < char > is a lower case letter , the message “ The Upper case character corresponding to <char > is …….. “ ii) If < char > is a Upper case letter , the message “ The Lower case character corresponding to <char > is …….. “

iii) if <char> is not a letter the message < char> is not a letter

15. What is a loop ? Write the different types of looping constructs in C++ .16. Write code to print the following series 1) 2 5 8 11 14 17 20 23 26 29 32 35 38 41 44 47 50 2) 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 3) Sum of numbers from 1 to 100.

Submitted by: Mr. Saju . B . Pillai (PGT Computer Science)-

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