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An operator is a symbol which helps the user give the command to computer, and computer to do a certain mathematical or logical manipulations. Operators are used in C language program to operate on data and variables. C has a rich set of operators which can be classified as:

- Arithmetic operator
- Relational Operators
- Logical Operators
- Assignment Operators
- Increments and Decrement Operators
- Conditional Operators
- Bitwise Operators
- Special Operators

Arithmetic operators means do the all arithmetic operations like as addition, subtraction, multiplication , division, modules etc. All the operators have almost the same meaning as in other languages. Both unary and binary operations are available in C language. Unary operations operate on a singe operand, therefore the number 5 when operated by unary – will have the value –5.

Operator | Meaning |

+ | Addition or Unary Plus |

– | Subtraction or Unary Minus |

* | Multiplication |

/ | Division |

% | Modulus Operator |

*Example*

#include<stdio.h>//include header file stdio.h void main()//tell the compiler the start of the program { int numb1, num2, sum, sub, mul, div, mod;//declaration of variables scanf (“%d %d”, &num1, &num2); //inputs the operands sum = num1+num2; //addition of numbers and storing in sum. printf(“\n Thu sum is = %d”, sum);//display the output sub = num1-num2;//subtraction of numbers and storing in sub. printf(“\n Thu difference is = %d”, sub); //display the output mul = num1*num2;//multiplication of numbers and storing in mul. printf(“\n Thu product is = %d”, mul); //display the output div = num1/num2;//division of numbers and storing in div. printf(“\n Thu division is = %d”, div); //display the output mod = num1%num2;//modulus of numbers and storing in mod. printf(“\n Thu modulus is = %d”, mod); //display the output }

### Integer Arithmetic

When an arithmetic operation is performed on two whole numbers or integers than such an operation is called as integer arithmetic. It always gives an integer as the result.

Let x = 20 and y = 5 be 2 integer numbers. Then the integer operation leads to the following results.

x+y=27 x–y=15 x*y=100 x%y=0 x/y=4

* In integer division the fractional part is truncated.

### Floating point arithmetic

When an arithmetic operation is preformed on two real numbers or fraction numbers such an operation is called floating point arithmetic. The floating point results can be truncated according to the properties requirement. The remainder operator is not applicable for floating point arithmetic operands.

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

### Mixed mode arithmetic

When one of the operand is real and other is an integer and if the arithmetic operation is carried out on these 2 operands then it is called as mixed mode arithmetic. If any one operand is of real type then the result will always be real thus 15/10.0 = 1.5

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