Prime number in c

Prime number c program

int isPrime(int n) {
  for (int i = 2; i < n; i++) if (n % i == 0) return 0; 
  return 1;
}

Prime Number Check Program in C

#include <stdio.h> 

main() {
  int n, i, c = 0;
  printf("Enter any number n:");
  scanf("%d", &n);

  //logic
  for (i = 1; i <= n; i++) {
      if (n % i == 0) {
         c++;
      }
  }

  if (c == 2) {
  printf("n is a Prime number");
  }
  else {
  printf("n is not a Prime number");
  }
  return 0;    
}
Program Output:

Source: w3schools.in

Prime number in c

flag=0;
scanf("%d", &num);
for(i=2;i<=(num/2);i++)
    {
       if(num%i==0)
          flag=1;
    }
    if(flag==0)
        printf("%d is a prime number",num);

Source: studyfame.com

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