# If else Exercises

**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

**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.

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 */ #includeint 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; }

**Output**

Enter any number: 55

Number is divisible by 5 and 11