申論 5以下C++程式的目的為何？詳述執行流程並寫出程式的輸出。（20分）#include <iostream>#include <iomanip>using namespace std;int main(){int x = 30, y = 100, ok = 1;int i, j;for(i = x ; i <= y; i++){ok = 1;for(j = 2; j < i ; j++)if(i % j == 0){ok = 0;break;}if(ok == 1) cout << i << "";}cout << endl;return 0;}