Write a C function to check if a number is prime. Use this function to display all prime numbers between 100 and 500.

#include <stdio.h>

int checkPrimeNumber(int n);

int main()

{

int n1, n2, i, flag;

printf("Enter two positive integers for range: ");

scanf("%d %d", &n1, &n2);

// swap n1 and n2 if n1 > n2

if (n1 > n2) 

{

n1 = n1 + n2;

n2 = n1 - n2;

n1 = n1 - n2;

}

printf("Prime numbers between %d and %d are:\n", n1, n2);

for(i = n1 + 1; i < n2; ++i) 

{

// flag will be equal to 1 if i is prime

flag = checkPrimeNumber(i);

if(flag == 1)

printf("%d ", i);

}

return 0;

}

int checkPrimeNumber(int n) 

{

int j, flag = 1;

for (j = 2; j <= n / 2; ++j) 

{

if (n % j == 0) 

{

flag = 0;

break;

}

}

return flag;

}