In this tutorial, you will find out about various **operators** in **C programming** with the help of an example.

An operator is a symbol that works on a worth or a variable. For instance: + is an operator to perform addition.

C has a wide range of operators to perform different operations.

In this article, you will learn-

- 1 C Arithmetic Operators
- 2 Example 1: Arithmetic Operators
- 3 C Increment and Decrement Operators
- 4 Example 2: Increment and Decrement Operators
- 5 C Assignment Operators
- 6 Example 3: Assignment Operators
- 7 C Relational Operators
- 8 Example 4: Relational Operators
- 9 C Logical Operators
- 10 Example 5: Logical Operators
- 11 C Bitwise Operators
- 12 Comma Operator
- 13 The sizeof operator
- 14 Example 6: sizeof Operator

## C Arithmetic Operators

An arithmetic operator performs mathematical operations, for example, expansion, deduction, augmentation, division, and so on numerical qualities (constants and variables).

Operator | Meaning of Operator |

+ | addition or unary plus |

– | subtraction or unary minus |

* | multiplication |

/ | division |

% | remainder after division (modulo division) |

## Example 1: Arithmetic Operators

// Working of arithmetic operators #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; }

a+b = 13 a-b = 5 a*b = 36 a/b = 2 Remainder when a divided by b=1

The operators +, – and * computes addition, subtraction, and multiplication respectively as you might have expected.

In normal calculation, 9/4 = 2.25. However, the output is 2 in the program.

It is because both the variables a and b are integers. Hence, the output is also an integer. The compiler neglects the term after the decimal point and shows answer 2 instead of 2.25.

The modulo operator % computes the remainder. When a=9 is divided by b=4, the remainder is 1. The % operator can only be used with integers.

Suppose a = 5.0, b = 2.0, c = 5 and d = 2. Then in C programming,

// Either one of the operands is a floating-point number a/b = 2.5 a/d = 2.5 c/b = 2.5 // Both operands are integers c/d = 2

## C 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 ++ expands the incentive by 1 while decrement – diminishes the incentive by 1. These two operators are unary operators, meaning they only operate on a single operand.

## Example 2: Increment and Decrement Operators

```
// Working of increment and decrement operators
#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

Here, the operators ++ and — are used as prefixes. These two operators can also be used as postfixes like a++ and a–.

## C Assignment Operators

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

Operator | Example | Same as |

= | a = b | a = b |

+= | a += b | a = a+b |

-= | a -= b | a = a-b |

*= | a *= b | a = a*b |

/= | a /= b | a = a/b |

%= | a %= b | a = a%b |

## Example 3: Assignment Operators

```
// Working of assignment operators
#include <stdio.h>
int main()
{
int a = 5, c;
c = a; // c is 5
printf("c = %d\n", c);
c += a; // c is 10
printf("c = %d\n", c);
c -= a; // c is 5
printf("c = %d\n", c);
c *= a; // c is 25
printf("c = %d\n", c);
c /= a; // c is 5
printf("c = %d\n", c);
c %= a; // c = 0
printf("c = %d\n", c);
return 0;
}
```

Output

c = 5 c = 10 c = 5 c = 25 c = 5 c = 0

## C Relational Operators

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

Operator | Meaning of Operator | Example |

== | Equal to | 5 == 3 is evaluated to 0 |

> | Greater than | 5 > 3 is evaluated to 1 |

< | Less than | 5 < 3 is evaluated to 0 |

!= | Not equal to | 5 != 3 is evaluated to 1 |

>= | Greater than or equal to | 5 >= 3 is evaluated to 1 |

<= | Less than or equal to | 5 <= 3 is evaluated to 0 |

## Example 4: Relational Operators

```
// Working of relational operators
#include <stdio.h>
int main()
{
int a = 5, b = 5, c = 10;
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;
}
```

Output

5 == 5 is 1 5 == 10 is 0 5 > 5 is 0 5 > 10 is 0 5 < 5 is 0 5 < 10 is 1 5 != 5 is 0 5 != 10 is 1 5 >= 5 is 1 5 >= 10 is 0 5 <= 5 is 1 5 <= 10 is 1

## C Logical Operators

An expression containing a 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.

Operator | Meaning | Example |

&& | Logical AND. True only if all operands are true | If c = 5 and d = 2 then, expression ((c==5) && (d>5)) equals to 0. |

|| | Logical OR. True only if either one operand is true | If c = 5 and d = 2 then, expression ((c==5) || (d>5)) equals to 1. |

! | Logical NOT. True only if the operand is 0 | If c = 5 then, expression !(c==5) equals to 0. |

## Example 5: Logical Operators

```
// Working of logical operators
#include <stdio.h>
int main()
{
int a = 5, b = 5, c = 10, result;
result = (a == b) && (c > b);
printf("(a == b) && (c > b) is %d \n", result);
result = (a == b) && (c < b);
printf("(a == b) && (c < b) is %d \n", result);
result = (a == b) || (c < b);
printf("(a == b) || (c < b) is %d \n", result);
result = (a != b) || (c < b);
printf("(a != b) || (c < b) is %d \n", result);
result = !(a != b);
printf("!(a == b) is %d \n", result);
result = !(a == b);
printf("!(a == b) is %d \n", result);
return 0;
}
```

Output

(a == b) && (c > b) is 1 (a == b) && (c < b) is 0 (a == b) || (c < b) is 1 (a != b) || (c < b) is 0 !(a != b) is 1 !(a == b) is 0

Explanation of logical operator program

(a == b) && (c > 5) evaluates to 1 because both operands (a == b) and (c > b) is 1 (true).

(a == b) && (c < b) evaluates to 0 because operand (c < b) is 0 (false).

(a == b) || (c < b) evaluates to 1 because (a = b) is 1 (true).

(a != b) || (c < b) evaluates to 0 because both operand (a != b) and (c < b) are 0 (false).

!(a != b) evaluates to 1 because operand (a != b) is 0 (false). Hence, !(a != b) is 1 (true).

!(a == b) evaluates to 0 because (a == b) is 1 (true). Hence, !(a == b) is 0 (false).

## C Bitwise Operators

During computation, mathematical operations like: addition, subtraction, multiplication, division, and so on are changed over to bit-level which makes handling quicker and saves power.

Bitwise administrators are utilized in C programming to perform bit-level operations.

Operators | Meaning of operators |

& | Bitwise AND |

| | Bitwise OR |

^ | Bitwise exclusive OR |

~ | Bitwise complement |

<< | Shift left |

>> | Shift right |

## Comma Operator

Comma operators are used to linking related expressions together. For example:

`int a, c = 5, d;`

## The sizeof operator

The sizeof is a unary operator that returns the size of data (constants, variables, array, structure, etc).

## Example 6: sizeof Operator

```
#include <stdio.h>
int main()
{
int a;
float b;
double c;
char d;
printf("Size of int=%lu bytes\n",sizeof(a));
printf("Size of float=%lu bytes\n",sizeof(b));
printf("Size of double=%lu bytes\n",sizeof(c));
printf("Size of char=%lu byte\n",sizeof(d));
return 0;
}
```

Output

Size of int = 4 bytes Size of float = 4 bytes Size of double = 8 bytes Size of char = 1 byte

Other operators such as ternary operator ?:, reference operator &, dereference operator * and member selection operator -> will be discussed in later tutorials.

Please feel free to give your comment if you face any difficulty here.

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