C program to check whether a number is divisible by 5 and 11 or not

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

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.

1. Input a number from user. Store it in some variable say num.
2. To check divisibility with 5, check if(num % 5 == 0) then num is divisible by 5.
3. To check divisibility with 11, check if(num % 11 == 0) then num is divisible by 11.
4. 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 😉 