//Downloaded From theonlinetutorials.com
#include"stdio.h"
#include"conio.h"
#include"math.h"
void main()
{
int n;
clrscr();
printf(" Enter a number: ");
scanf("%d",&n);
n=abs(n);
while(n>3)
n-=3;
if(n==3)
printf("no is multiple of 3");
else
printf("no is not multiple of 3");
getch();
}

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Tagged as: C Program - Find whether a given number is a multiple of 3 or not, Find whether a given number is a multiple of 3 or not, Find whether a given number is a multiple of 3 or not in C