6. (A) Programs on Functions.

6. (A) Programs on Functions.  

#include <stdio.h>
	int checkPrimeNumber(int n);
	int main()
	{
	int n1, n2, i, flag;
	printf("Enter two positive integers: ");
	scanf("%d %d", &n1, &n2);
	printf("Prime numberbers between %d and %d are: ", n1, n2);
	for(i=n1+1; i<n2; ++i)
	{
	// i is a prime number, flag will be equal to 1
	flag = checkPrimeNumber(i);
	if(flag == 1)
	printf("%d ",i);
	}
	return 0;
	}
	// user-defined function to check prime number
	int checkPrimeNumber(int n)
	{
	int j, flag = 1;
	for(j=2; j <= n/2; ++j)
	{
	if (n%j == 0)
	{
	flag =0;
	break;
	}
	}
	return flag;