C :

#include<stdio.h>
int prime(int n)
{
	for(int i = 2; i * i <= n; i++)
		if(n % i == 0)
			return 0;
		return 1;
}
int main()
{
	int i, j, k, s;
	int a[13] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
	for(i = 1988; i <= 1989; i++)
	{
		if((i % 4 == 0 && i % 100 != 0)||(i % 400) == 0)
			a[2] = 29;
		else
			a[2] = 28;
		for(j = 1; j <= 12; j++)
			for(k = 1; k <= a[j]; k++)
			{
				s = i * 10000 + j * 100 + k;
				if(prime(s))
					printf("%d\n", s);
			}
	}
}

C++ :

#include<stdio.h>
int prime(int n)
{
	for(int i = 2; i * i <= n; i++)
		if(n % i == 0)
			return 0;
		return 1;
}
int main()
{
	int i, j, k, s;
	int a[13] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
	for(i = 1988; i <= 1989; i++)
	{
		if((i % 4 == 0 && i % 100 != 0)||(i % 400) == 0)
			a[2] = 29;
		else
			a[2] = 28;
		for(j = 1; j <= 12; j++)
			for(k = 1; k <= a[j]; k++)
			{
				s = i * 10000 + j * 100 + k;
				if(prime(s))
					printf("%d\n", s);
			}
	}
}