Operators in C by G Krishna Chauhan

An operator is a symbol that tells the compiler to perform specific mathematical or logical functions. C language is rich in built-in operators and provides the following types of operators −

Arithmetic Operators
Increment and Decrement Operators
Assignment Operators
Relational Operators
Logical Operators
Conditional Operators
Bitwise Operators
Special Operators
C Arithmetic Operators:
An arithmetic operator performs mathematical operations such as addition, subtraction and multiplication on numerical values (constants and variables).
Increment and decrement operators:C programming has two operators increment ++ and decrement -- to change the value of an operand (constant or variable) by 1.
Increment ++ increases the value by 1 whereas decrement -- decreases the value by 1. These two operators are unary operators, meaning they only operate on a single operand.
#include <stdio.h>

Example Program:

#include <stdio.h>

int main()

{

int a = 10, b = 100;

float c = 10.5, d = 100.5;

printf("++a = %d \n", ++a);

printf("--b = %d \n", --b);

printf("++c = %f \n", ++c);

printf("--d = %f \n", --d);

return 0;

}

Output:

++a = 11

--b = 99

++c = 11.500000

++d = 99.500000

C Assignment Operators:

An assignment operator is used for assigning a value to a variable. The most common assignment operator is =

Example Program:

#include <stdio.h>

int main()

{

int a = 9,b = 4, c;

c = a+b;

printf("a+b = %d \n",c);

c = a-b;

printf("a-b = %d \n",c);

c = a*b;

printf("a*b = %d \n",c);

c=a/b;

printf("a/b = %d \n",c);

c=a%b;

printf("Remainder when a divided by b = %d \n",c);

return 0;

}

Output:

a+b = 13

a-b = 5

a*b = 36

a/b = 2

Remainder when a divided by b=1

C Relational Operators:

A relational operator checks the relationship between two operands. If the relation is true, it returns 1; if the relation is false, it returns value 0.

Relational operators are used in decision making and loops.

Example Program:

#include<stdio.h>

int main()

{

int a = 5, b = 5, c = 10;

printf("%d == %d = %d \n", a, b, a == b); // true

printf("%d == %d = %d \n", a, c, a == c); // false

printf("%d > %d = %d \n", a, b, a > b); //false

printf("%d > %d = %d \n", a, c, a > c); //false

printf("%d < %d = %d \n", a, b, a < b); //false

printf("%d < %d = %d \n", a, c, a < c); //true

printf("%d != %d = %d \n", a, b, a != b); //false

printf("%d != %d = %d \n", a, c, a != c); //true

printf("%d >= %d = %d \n", a, b, a >= b); //true

printf("%d >= %d = %d \n", a, c, a >= c); //false

printf("%d <= %d = %d \n", a, b, a <= b); //true

printf("%d <= %d = %d \n", a, c, a <= c); //true

return 0;

}

Output

5 == 5 = 1

5 == 10 = 0

5 > 5 = 0

5 > 10 = 0

5 < 5 = 0

5 < 10 = 1

5 != 5 = 0

5 != 10 = 1

5 >= 5 = 1

5 >= 10 = 0

5 <= 5 = 1

5 <= 10 = 1

C Logical Operators:

An expression containing logical operator returns either 0 or 1 depending upon whether expression results true or false. Logical operators are commonly used in decision making in C programming.

Example Program:

#include <stdio.h>

int main()

{

int a = 5, b = 5, c = 10, result;

result = (a = b) && (c > b);

printf("(a = b) && (c > b) equals to %d \n", result);

result = (a = b) && (c < b);

printf("(a = b) && (c < b) equals to %d \n", result);

result = (a = b) || (c < b);

printf("(a = b) || (c < b) equals to %d \n", result);

result = (a != b) || (c < b);

printf("(a != b) || (c < b) equals to %d \n", result);

result = !(a != b);

printf("!(a == b) equals to %d \n", result);

result = !(a == b);

printf("!(a == b) equals to %d \n", result);

return 0;

}

Output:

(a = b) && (c > b) equals to 1

(a = b) && (c < b) equals to 0

(a = b) || (c < b) equals to 1

(a != b) || (c < b) equals to 0

!(a != b) equals to 1

!(a == b) equals to 0

Bitwise Operators

During computation, mathematical operations like: addition, subtraction, addition and division are converted to bit-level which makes processing faster and saves power.

Bitwise operators are used in C programming to perform bit-level operations.