Question

C Programming

Read four numbers and find the largest value. Check if the largest value is multiple of 3.

Answer 1

Code:
#include <stdio.h>

int main()
{
   /* variable declaration */
   int i, max;
   int a[50];

   /* asking user to enter 4 numbers as input */  
   for(i = 1; i <= 4; i++){
       printf("\nEnter number %d : ", i);
       scanf("%d", &a[i]);
   }

   /* initializing max to the first element */
   max = a[0];
   /* identifying max out of four numbers given */
   for(i = 2; i <= 4; i++){  
       if(a[i] > max)
           max = a[i];
   }

   /* checking if max number is multiple of 3 */
   if(max % 3 == 0)
       printf("\nMax number %d is a multiple of 3\n", max);
   else
       printf("\nMax number %d is not a multiple of 3\n", max);
  

   return 0;
}

Execution and output:
Unix Terminal> ./a.out

Enter number 1 : 18

Enter number 2 : 29

Enter number 3 : 3

Enter number 4 : 56

Max number 56 is not a multiple of 3
Unix Terminal> ./a.out

Enter number 1 : 10

Enter number 2 : 18

Enter number 3 : 7

Enter number 4 : 4

Max number 18 is a multiple of 3
Unix Terminal>