C Program To Check Whether A Given Number Is Prime Or Not Using Loops

Program Code:

#include <stdio.h>
int main() 
{
  int n, i, flag = 0;
  printf("Enter a positive integer: ");
  scanf("%d", &n);
  for (i = 2; i <= n / 2; ++i) 
{
    if (n % i == 0) 
{
      flag = 1;
      break;
    }
  }
  if (n == 1) 
{
    printf("1 is neither prime nor composite.");
  } 
  else 
{
    if (flag == 0)
      printf("%d is a prime number.", n);
    else
      printf("%d is not a prime number.", n);
  }
  return 0;
}

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