//code to check if the number is a multiple of 3.
//includes
#include <stdio.h>
#include <conio.h>
//main thread
int main()
{
    int n;//local variable.
    printf("enter the value of a number",n);//enter a value of the number.
    scanf("%d",&n);
    if ( n / 3 == 1)//check if the number is divisible by 3.
    {
        printf("The number is a  multiple of 3\n");//if the condition is true the print this statement.

    }
        else{
        printf("The number is not multiple of 3\n");//if the condition is false then print this statement.

        }

}