A simple prime number program. Beginners hope that older bosses can have a look

#include <stdio.h>
int main()
{
    
	int  k;	
	void prime(int k);
	int flag = 1;
	char ch;
	while(flag)
	{
    
		printf(" Enter a number to judge whether it is a prime number ");
		scanf_s("%d", &k);
		prime(k);
		printf(" Input N End judgment or continue ");
		getchar();
		ch=getchar();
		if (ch == 'N' || ch == 'n')
			flag = 0;

	}
}
void prime(int k)
{
    
	int i;
	for (i = 2; i <= k / 2; i++)
		if (k % i == 0)
		{
    
		printf("%d is not prime", k);
		break;
		}
		else if(i==k/2)
			printf("%d is prime", k);



}