# Operators in C | Set 1 (Arithmetic Operators)

Operators are the foundation of any programming language. Thus the functionality of C language is incomplete without the use of operators. Operators allow us to perform different kinds of operations on operands. In C, operators in Can be categorized in following categories:

**Arithmetic Operator**s (+, -, *, /, %, post-increment, pre-increment, post-decrement, pre-decrement)**Relational Operators**(==, !=, >, <, >= & <=) Logical Operators (&&, || and !)**Bitwise Operators**(&, |, ^, ~, >> and <<)**Assignment Operator**s (=, +=, -=, *=, etc)**Other Operators**(conditional, comma, sizeof, address, redirecton)

**Arithmetic Operators:** These are used to perform arithmetic/mathematical operations on operands. The binary operators falling in this category are:

**Addition:**The**‘+’**operator adds two operands. For example,**x+y**.**Subtraction:**The**‘-‘**operator subtracts two operands. For example,**x-y**.**Multiplication:**The**‘*’**operator multiplies two operands. For example,**x*y**.**Division:**The**‘/’**operator divides the first operand by the second. For example,**x/y**.**Modulus:**The**‘%’**operator returns the remainder when first operand is divided by the second. For example,**x%y**.

`// C program to demonstrate working of binary arithmetic operators ` `#include <stdio.h> ` ` ` `int` `main() ` `{ ` ` ` `int` `a = 10, b = 4, res; ` ` ` ` ` `// printing a and b ` ` ` `printf` `(` `"a is %d and b is %d\n"` `, a, b); ` ` ` ` ` `res = a + b; ` `// addition ` ` ` `printf` `(` `"a+b is %d\n"` `, res); ` ` ` ` ` `res = a - b; ` `// subtraction ` ` ` `printf` `(` `"a-b is %d\n"` `, res); ` ` ` ` ` `res = a * b; ` `// multiplication ` ` ` `printf` `(` `"a*b is %d\n"` `, res); ` ` ` ` ` `res = a / b; ` `// division ` ` ` `printf` `(` `"a/b is %d\n"` `, res); ` ` ` ` ` `res = a % b; ` `// modulus ` ` ` `printf` `(` `"a%b is %d\n"` `, res); ` ` ` ` ` `return` `0; ` `} ` |

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Output:

a is 10 and b is 4 a+b is 14 a-b is 6 a*b is 40 a/b is 2 a%b is 2

The ones falling into the category of unary arithmetic operators are:

**Increment:**The**‘++’**operator is used to increment the value of an integer. When placed before the variable name (also called pre-increment operator), its value is incremented instantly. For example,**++x**.

And when it is placed after the variable name (also called post-increment operator), its value is preserved temporarily until the execution of this statement and it gets updated before the execution of the next statement. For example,**x++**.**Decrement:**The**‘ – – ‘**operator is used to decrement the value of an integer. When placed before the variable name (also called pre-decrement operator), its value is decremented instantly. For example,**– – x**.

And when it is placed after the variable name (also called post-decrement operator), its value is preserved temporarily until the execution of this statement and it gets updated before the execution of the next statement. For example,**x – –**.

`// C program to demonstrate working of Unary arithmetic operators ` `#include <stdio.h> ` ` ` `int` `main() ` `{ ` ` ` `int` `a = 10, b = 4, res; ` ` ` ` ` `// post-increment example: ` ` ` `// res is assigned 10 only, a is not updated yet ` ` ` `res = a++; ` ` ` `printf` `(` `"a is %d and res is %d\n"` `, a, res); ` `// a becomes 11 now ` ` ` ` ` `// post-decrement example: ` ` ` `// res is assigned 11 only, a is not updated yet ` ` ` `res = a--; ` ` ` `printf` `(` `"a is %d and res is %d\n"` `, a, res); ` `// a becomes 10 now ` ` ` ` ` `// pre-increment example: ` ` ` `// res is assigned 11 now since a is updated here itself ` ` ` `res = ++a; ` ` ` `// a and res have same values = 11 ` ` ` `printf` `(` `"a is %d and res is %d\n"` `, a, res); ` ` ` ` ` `// pre-decrement example: ` ` ` `// res is assigned 10 only since a is updated here itself ` ` ` `res = --a; ` ` ` `// a and res have same values = 10 ` ` ` `printf` `(` `"a is %d and res is %d\n"` `, a, res); ` ` ` ` ` `return` `0; ` `} ` |

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Output:

a is 11 and res is 10 a is 10 and res is 11 a is 11 and res is 11 a is 10 and res is 10

We will soon be discussing other categories of operators in different posts.

To know about **Operator Precedence and Associativity**, refer this link:

This article is contributed by Ayush Jaggi. Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above

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