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Program to Print prime number Pyramid

Program to Print prime number Pyramid

 Prime Numbers : Numbers that are divisible by 1 and number itself is called Prime number.

    This program is nothing  but the pyramid of the prime numbers .
    To Evaluate Number is Prime or not Consecutively divide that number from 2 to n/2
    Example : to find whether 17 is prime or not divide that number from 2 to (17/2 = 8) if none of the remainder is zero then the number is surely prime else number is non-prime.
    Remaining Logic is same as Any other Nested Pyramid


#include<stdio.h>

int prime(int num);
int main() {
   int x, y;
   int num = 2;

   for (x = 0; x < 5; x++) {
      printf("\n");
      for (y = 0; y <= x; y++) {
         while (!prime(num)) {
            num++;
         }
         printf("%d\t", num++);
      }
   }
   return (0);
}

int prime(int num) {
   int x, flag;
   for (x = 2; x < num; x++) {
      if (num % x != 0)
         flag = 1;
      else {
         flag = 0;
         break;
      }
   }

   if (flag == 1 || num == 2)
      return (1);
   else
      return (0);
}

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