C program to chek divisibility of number

C program to chek divisibility of a given number

By Ahmad Irshad | C Programming Exercises and Soluntions > If...Else  

Write a C program to input a number from user and check it's divisibility by some other number as divisor using if...else. Let's see the below step by step logic check divisibility of a number.

Exmaple:

1. INPUT
2. 
   
3. Enter any number to check it's divisibility: 30
4. Enter another number as divisior: 6

1. Enter any number to check it's divisibility: 45
2. Enter another number as divisior: 8

1. 
   

  OUTPUT

30 is divisible by 6.

45 is not divisible by 8.

Required knowledge for this exercise

Input / output | Variables | Data types | If-else | Relational operator | Logical operator | Arithmetic operator

Logic to check divisibility of a number using if...else:

A number is exactly divisible by some other number if it gives 0 as remainder after dividing otherwise not. Example: 18 is exactly divisible by 9 i.e18 / 9 = 2with a remainder 0.

in C, modulo% division operator returns remainder after integer division. If it returns zero it means number is exactly divisible otherwise not. For Example: if(18 % 4 == 0)it's not true since it returns 2 as remainder, therefore 18 is not divisible by 4. 

Now let's see the below step by step logic to check divisibility of a number.

1) Input any number from user and store it in variable num using scanf()

2) Check the given number is exactly divisible by some other number or not using modulo % operator. Likeif (num % divisor == 0)if it's remainder is equal to0then number is exactly divisible otherwise not. Since we know that, modulo %operator always returns remainder.

Program to check divisibility of a number using if...else: 

/* C program to check divisiblity of a number */ #include <stdio.h> int main() { int num, divisor; /* Input a number from user */ printf("Enter any number to check it's divisivility: "); scanf("%d", &num);

/* Input another number as divisor from user */ printf("Enter another number as divisor: "); scanf("%d", &divisior); /* * If num modulo division % and another number as divisor i.e * if(num % divisor == 0) is equal to 0 then number is divisible else not. */ if(num % dvisor == 0) { printf("Yes! %d is divisible by %d", num, divisior); } else { printf("NO! %d is not divisible %d", num, divisor); } return 0; }

Output:

Enter any number to check it's divisibility: 30
Enter another number as divisor: 6
Yes! 30 is divisible by 6

Enter any number to check it's divisibility: 45 
Enter another number as divisor: 8
No! 45 is not divisible by 8

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