C Operators

1. Arithmetic operators 2. Relational Operators 3. Logical Operators 4. Assignment Operators 5. Increments and Decrement Operators 6. Conditional Operators 7. Bitwise Operators 8. Special Operators

Arithmetic operatorsOperator Meaning

+ Addition or Unary Plus

– Subtraction or Unary Minus

* Multiplication

/ Division

% Modulus Operator

Integer Arithmetic

Let x = 27 and y = 5 z = x + y 32

z = x – y 22 z = x * y 115 z = x % y 2 z = x / y 5

Floating point arithmetic

Let x = 14.0 and y = 4.0 then z = x + y 18.0 z = x – y 10.0 z = x * y 56.0 z = x / y 3.50

Mixed mode arithmetic

15/10.0 = 1.5

Relational OperatorsOperator Meaning

< is less than

<= is less than or equal to

> is greater than

>= is greater than or equal to

== is equal to

!= is not equal to

Relational Expressions

6.5 <= 25 TRUE -65 > 0 FALSE 10 < 7 + 5 TRUE

Logical Operators

Operator Meaning

&& Logical AND

|| Logical OR

! Logical NOT

Find out the answer

a > b && x = = 10 a < m || a < n! (x >= y)

a = 5b = 4

x=10, y = 9 m=6 n = 3

Assignment Operators Statement with simple

assignment operatorStatement with shorthand operator

a = a + 1 a += 1

a = a – 1 a -= 1

a = a * (n+1) a *= (n+1)

a = a / (n+1) a /= (n+1)

a = a % b a %= b

What is the output?

#define N 100 //creates a variable N with constant value 100 #define A 2 //creates a variable A with constant value 2 main() //start of the program {

int a; //variable a declaration a = A; //assigns value 2 to a

while (a < N) //while value of a is less than N { //evaluate or do the following

printf(“%d \n”,a); //print the current value of a a *= a; //shorthand form of a = a * a

} //end of the loop } //end of the program

Output

2 4

16

Increment and Decrement Operators

1. ++ v2. v++ 3. – –v4. V--

m = 5; y = ++m; (prefix) After Execution:

y=6, m=6

m = 5; y = m++; (post fix)After Execution:

y=5, m=6

Conditional or Ternary Operator

a = 10; b = 15; x = (a > b) ? a : b

Bitwise Operators Operator Meaning

& Bitwise AND

| Bitwise OR

^ Bitwise Exclusive

<< Shift left

>> Shift right

Special Operators

comma operatorsize of operatorpointer operators (& and *) member selection operators (. and ->).

The Comma Operator

value = (x = 10, y = 5, x + y);

In for loops: for (n=1, m=10, n <=m; n++,m++)

In while loops While (c=getchar(), c != ‘1’)

Exchanging values

t = x, x = y, y = t;

The size of Operator

m = sizeof (sum); n = sizeof (long int); k = sizeof (235L);

What is the output?

main() //start of program { int a, b, c, d; //declaration of variables a = 15; b = 10; c = ++a-b; //assign values to variables printf (“a = %d, b = %d, c = %d\n”, a,b,c); //print the values d=b++ + a; printf (“a = %d, b = %d, d = %d\n, a,b,d); printf (“a / b = %d\n, a / b); printf (“a %% b = %d\n, a % b); printf (“a *= b = %d\n, a *= b); printf (“%d\n, (c > d) ? 1 : 0 ); printf (“%d\n, (c < d) ? 1 : 0 ); }