## C Language Operators

*What are operators? *

Programming languages typically support a set of **operators**: operations which differ in the calling of syntax and/or the argument passing mode from the language’s functions. Common examples that differ by syntax are mathematical arithmetic operations, e.g. “>” for “greater than”, with names often outside the language’s set of identifiers for functions, and called with a syntax different from the language’s syntax for calling functions. Common examples that differ by argument passing mode are boolean operations, e.g. a short-circuiting conjunction that only evaluates later arguments if earlier ones are not false, in a language with strict call-by-value functions.

*–Wikipedia*

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### 1. Assignment Operator(=) and Arithmetic Operators(+, -, *, /, %)

Operator |
Function |
Direction of Function |

= | Substitute the value on the right to the left Ex) a=42 |
← |

+ | Add Left value to the right value Ex) a=45+6 |
→ |

– | Subtract the value on the right from the left Ex) a=5-4 |
→ |

* | Multiply the values Ex) a=4*3 |
→ |

/ | Divide the value on the left with the right Ex) a=2/6 |
→ |

% | Divide the value on the left and show the remainder Ex) a=2%6 |
→ |

If you doubt what these are (except %), please consider going over your Primary 1 books.

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### 2. MORE Assignment Operators

a = a + b | a += b |

a = a – b | a -= b |

a = a * b | a *= b |

a = a / b | a /= b |

a = a % b | a %= b |

The functions on the left is same as the functions on the right :)

Don’t get confused with *+=* and *=+*!!

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### 3. MORE Arithmetic Operators

Operator |
Function |
Direction of Function |

++a | Add 1 and carry out further functions Ex) a=1 printf(“a is %d”, ++a);[ a is 2 ], a=2 |
← |

a++ | Carry out the function and add 1 Ex) a=1 printf(“a is %d”, a++);[ a is 1 ], a=2 |
← |

–a | Subtract 1 and carry out further functions Ex) a=1 printf(“a is %d”, –a);[ a is 0 ], a=0 |
← |

a– | Carry out the function and subtract 1 Ex) a=1 printf(“a is %d”, a–);[ a is 1 ], a=0 |
← |

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### 4. Relational Operators

Operator |
Function |
Direction of Function |

< | a<b Is a smaller than b? |
→ |

> | a>b Is a greater than b? |
→ |

== | a==b Does a equal to b? |
→ |

!= | a!=b Does a not equal to b? |
→ |

<= | a<=b Is a smaller or equal to b? |
→ |

>= | a>=b Is a greater or equal to b? |
→ |

They always give a boolen value :)

therefore..

int val1 = 12;

int val2 = 10;int result1 = (val1==val2);

printf(“Result : %d”, result1);

wil give

Result : 0

since val1 does not equal to val2.

(1=true, 0=false)

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### 5. Logical Operators

Operator |
Function |
Direction of Function |

&& | If both are true, value is true (and) Ex) a&&b |
→ |

|| | If both any one is true, value is true (or) Ex) a || b |
→ |

! | If it’s true, value is false If it’s false, value is true Ex) !a |
← |

Once again, boolen values :)

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### 6. Comma(,) Operator

This operator is used in many ways. it is used when declaring multiple variables, calculating two functions in a single line and much more.

A good example is shown as below

#include <studio.h>

int main(void)

{

int a=4, b=2;//comma here

printf(“Hello “), printf(“World!\n”);//commaprintf(“%d”, a), printf(“%d”, b);

return 0;

}

This will give..

Hello World!

42

:D

## Two Things to be Aware when you Declare a Variable

# 1. INTRODUCE FIRST

int main(void)

{

int a;//declare

int b;//declarea=5;//input

b=1;//inputprintf(“%d + %d = %d\n”, a, b, a+b);

return 0;

}

#### CORRECT :)

int main(void)

{

int a;//declare

a=5;//input

int b;//declare

b=1;//inputprintf(“%d + %d = %d\n”, a, b, a+b);

return 0;

}

#### WRONG :(

————————————————–

# 2. NAME IT PROPERLY

### 3 SIMPLE things! :D

1. Variables consist of Alphabets, Numbers and Underscore(_)

2. C Language differentiates *small letters* and **CAPITAL LETTERS** :D

Therefore *val* and **Val** are different variables :)

3. Variable CANNOT start with a Numb3r or be a Key Word! It should also not contain any Space or Special Letters

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