v++重覆輸入問題

用while(true)啦!!!
而using std::cout;
using std::cin;
using std::endl;
可寫成using namespace std;
#include <iostream>
using namespace std;

int main()
{
while(true) {
int n;
int factorial = 1;

cout<<"請輸入一個正整數:";
cin>>n;
if (n>=0) {
while (n>0)
{
factorial = n * factorial;
n = n-1;
}

cout<<"Factorial:"<<factorial<<endl;
}

if (n<0){
cout<<"你輸入的不是正整數\n";}
}


return 0;
}