Write a C program to check whether a number is divisible by 5 and 11 or not using if else. How to check divisibility of any number in C programming. C program to enter any number and check whether it is divisible by 5 and 11 or not. Logic to check divisibility of a number in C program.

**Example**

**Input**

Input number: 55

**Output**

Number is divisible by 5 and 11

## Required knowledge

Basic C programming, Arithmetic operators, Relational operators, Logical operators, If else

## Logic to check divisibility of a number

A number is exactly divisible by some other number if it gives 0 as remainder. To check if a number is exactly divisible by some number we need to test if it leaves 0 as remainder or not.

C supports a modulo operator `%`

, that evaluates remainder on division of two operands. You can use this to check if a number is exactly divisible by some number or not. For example – `if(8 % 2)`

, if the given expression evaluates `0`, then 8 is exactly divisible by 2.

Step by step descriptive logic to check whether a number is divisible by 5 and 11 or not.

- Input a number from user. Store it in some variable say
`num`. - To check divisibility with 5, check
`if(num % 5 == 0)`

then`num`is divisible by 5. - To check divisibility with 11, check
`if(num % 11 == 0)`

then`num`is divisible by 11. - Now combine the above two conditions using logical AND operator
`&&`

. To check divisibility with 5 and 11 both, check`if((num % 5 == 0) && (num % 11 == 0))`

, then number is divisible by both 5 and 11.

Let us implement the logic.

## Program to check divisibility of a number

```
/**
* C program to check divisibility of any number
*/
#include <stdio.h>
int main()
{
int num;
/* Input number from user */
printf("Enter any number: ");
scanf("%d", &num);
/*
* If num modulo division 5 is 0
* and num modulo division 11 is 0 then
* the number is divisible by 5 and 11 both
*/
if((num % 5 == 0) && (num % 11 == 0))
{
printf("Number is divisible by 5 and 11");
}
else
{
printf("Number is not divisible by 5 and 11");
}
return 0;
}
```

Let us get little geeky and impress others. You can also write the above divisibility condition as

```
if(!(num % 5) && !(num % 11))
printf("Number is divisible by 5 and 11");
else
printf("Number is not divisible by 5 and 11");
```

Think how it works. Still in doubt give 2 minutes on logical NOT operator `!`

.

**Important note:** Always remember modulo operator `%`

does not work with `float`

data type.

Output

Enter any number: 55 Number is divisible by 5 and 11

Happy coding 😉

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