c++ - 程序挂起不循环

Question

我是 C++ 的初学者。我编写了一个程序来分隔输入的整数中的数字并显示它们及其总和。然而，当循环重复时，即使编译完美，程序也会挂起。我尝试了“... while”循环和 while 循环，但问题仍然存在。我应该怎么做才能让它毫无问题地重复(向用户询问下一个整数，计算并显示结果)？任何帮助将不胜感激。

//Preprocessor directives
#include <iostream>
#include <cmath>

//Standard library
using namespace std;

//enter function main
int main()
{
int num;
int digit;
int sum = 0;
int pwr = 0;



cout << "Enter an integer: " << endl;
cin >> num;
cout << endl;
 while (num != 0 )
 {
//while loop to ask user to enter another number
cout << "The integer you entered is: " << num << endl;
cout << "The digits of " << num << " are: " << endl;

if (num < 0)
    num = -num;

    //find the highest number of 10 that divides the number

while (num / static_cast<int>(pow(10.0, pwr)) >= 10)
    pwr++;

while (num > 0)
{
    digit = num / static_cast<int>(pow(10.0, pwr));
    cout << digit << " ";
    sum = sum + digit;
    num = num % static_cast<int>(pow(10.0, pwr));
    pwr--;
}

if (pwr != -1) //Either num is 0 or there are trailing zeros in num
    while (pwr != -1)
    {
        cout << 0 << " ";
        pwr--;
    }
cout << endl;

cout << "The sum of the digits = " << sum << endl;

while (num != 0);
cout << "Enter another integer: " << endl;
cin >> num;
cout << endl;


}
 return 0;
}

Answer 1

//Preprocessor directives
#include <iostream>
#include <cmath>

//Standard library
using namespace std;

//enter function main
int main()
{

 while (true )
 {
//reset initial values every loop
int num;
int digit;
int sum = 0;
int pwr = 0;

cout << "Enter an integer: " << endl;
cin >> num;
cout << endl;
//same exit condition
if (num == 0)
    break;
//while loop to ask user to enter another number
cout << "The integer you entered is: " << num << endl;
cout << "The digits of " << num << " are: " << endl;

if (num < 0)
    num = -num;

    //find the highest number of 10 that divides the number

while (num / static_cast<int>(pow(10.0, pwr)) >= 10)
    pwr++;

while (num > 0)
{
    digit = num / static_cast<int>(pow(10.0, pwr));
    cout << digit << " ";
    sum = sum + digit;
    num = num % static_cast<int>(pow(10.0, pwr));
    pwr--;
}

if (pwr != -1) //Either num is 0 or there are trailing zeros in num
    while (pwr != -1)
    {
        cout << 0 << " ";
        pwr--;
    }
cout << endl;

cout << "The sum of the digits = " << sum << endl;
//extraneous
/*while (num != 0);
cout << "Enter another integer: " << endl;
cin >> num;
cout << endl;*/


}
 return 0;
}