C++递归如何在while中使用if语句

Question

我正在递归查找数字的阶乘，当我编写函数时一切正常：

#include <iostream>

using namespace std;

int factorialfinder(int x){
if(x==1){
    return 1;
}else{
    return x * factorialfinder(x-1);
}
}

int main()
{
int x;
cout << "Please enter a number for the factorial finder " << endl;
cin >> x;
cout << "The factorial of " << x << " is " << factorialfinder(x) << endl << endl;
cout << "Enter another number for the factorial finder " << endl;


while(x > -1){
    cin >> x;
    cout << "The factorial of " << x << " is " << factorialfinder(x) << endl << endl;
    cout << "Enter another number for the factorial finder " << endl;
}

}

但我想添加一个关于 if x is = 0 或

#include <iostream>

using namespace std;

int factorialfinder(int x){
if(x==1){
    return 1;
}else{
    return x * factorialfinder(x-1);
}
}

int main()
{
int x;
cout << "Please enter a number for the factorial finder " << endl;
cin >> x;
cout << "The factorial of " << x << " is " << factorialfinder(x) << endl << endl;
cout << "Enter another number for the factorial finder " << endl;


while(x > -1){
    cin >> x;
    if(x = 0 || x <= -1){
    cout << "Please enter a proper value to find the factorial";}
    else{
    cout << "The factorial of " << x << " is " << factorialfinder(x) << endl << endl;
    cout << "Enter another number for the factorial finder " << endl;}
}

}

Answer 1

您的 if 语句错误，您使用的是赋值运算符 = 而不是比较 ==

你需要这样写：

 if(x == 0 || x <= -1)

正如 Karsten Koop 指出的那样，您最好将其写为 if(x<=0)