Operators

Operators are indispensable in programming. We list common and useful operators in C for your study in this course.

C Arithmetic Operators

An arithmetic operator performs mathematical operations such as addition, subtraction, multiplication, division etc on numerical values (constants and variables).

Operator	Meaning of Operator
+	addition
-	subtraction
*	a decimal number
/	division
%	remainder after division (modulo division)

example: Arithmetic Operators

#include <stdio.h>
int main()
{
    int a = 11;
    int b = 3;
    int 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;
}

C Relational Operators

Relational operators determine one condition is True(1) or False(0), usually used in a loop and if condition.

Operator	Meaning of Operator	Example
==	equal	1 == 1 is evaluated to 1
>	greater than	int a; int b; a > b
\<	Less than	2 < 4 is evaluated to 1
!=	Not equal to	7 != 2 is evaluated to 1
>=	Greater than or equal to	2 >= 8 is evaluated to 0
<=	Less than or equal to	0 <= -4 is evaluated to 0

example: relational operators

#include <stdio.h>
int main()
{
    int a = 4, b = 7, c = 11;

    printf("%d == %d is %d \n", a, b, a == b);
    printf("%d == %d is %d \n", a, c, a == c);
    printf("%d > %d is %d \n", a, b, a > b);
    printf("%d > %d is %d \n", a, c, a > c);
    printf("%d < %d is %d \n", a, b, a < b);
    printf("%d < %d is %d \n", a, c, a < c);
    printf("%d != %d is %d \n", a, b, a != b);
    printf("%d != %d is %d \n", a, c, a != c);
    printf("%d >= %d is %d \n", a, b, a >= b);
    printf("%d >= %d is %d \n", a, c, a >= c);
    printf("%d <= %d is %d \n", a, b, a <= b);
    printf("%d <= %d is %d \n", a, c, a <= c);

    return 0;
}