我认为在 C++ 函数中应该如何工作的错误路径

问：

我正在参加 C++ 编程课程并从事一个项目。我对这个问题的糟糕路径有疑问。这是一个基于用户的温度转换输入问题。我有一条快乐的道路，但糟糕的道路并没有像我预期的那样行事。根据我的理解，如果我遇到了错误的路径，它应该等待我重新输入另一个输入，然后再退出。不过，在我的代码中，它只是打印错误路径中的所有信息并退出。

#include "unitConversionHeader.h"
#include <iostream>
#include <iomanip>
#include <cmath>
#include <typeinfo>
#include <any>
using namespace std;

void tempOutputs(int, char);

void tempConversion() {
    // Parent function.Collect the inputs, handle the conversions and checks then return the result.
    int temperature;
    char units;
    char retry;
    char killswitch;
    bool running;

    running = true;

    cout << "This program converts Temperatures from Fahrenheit to Celsius and vice versa. \n";

    while (running) {
        cout << "Please enter your temperature: \n";
        cin >> temperature;

        cout << "\n";
        if (cin.fail()) {

            cout << "The value you have entered is incorrect or not supported. Would you like to try again? (Y/N): \n";
            cin >> retry;
            units = toupper(retry);

            if (units == 'Y') {
                break;

            }
            else {
                cout << "Too many incorrect attempts. Exiting program now. \n";
                cout << "Thank you. Goodbye. \n";
                running = false;



            }
            
        }

        else if (cin.good()) {
                cout << "Please enter your units (F/C): ";
                // convert to upper to eliminate risk of inputting the wrong value, lowercase is sufficient
                cin >> units;
                units = toupper(units);
                cout << "\n";

                if (units == 'F' || units == 'C') {
                    tempOutputs(temperature, units);
                    cout << "\n";
                    cout << " Do you want another conversion? (Y/N): \n";
                    cin >> killswitch;
                    killswitch = toupper(killswitch);
                }
                if (killswitch == 'N') {
                    cout << "Thank you. Goodbye. \n";
                    running = false;
                }

            }
        }


    }




    
void tempOutputs(int temperature, char units) {
    // After receiving the inputs we add the conversion logic and then run the calculations
    string lhs = "Celsius";
    string rhs = "Celsius";
    int calculation;

    if (units == 'F') {
        lhs = "Fahrenheit";

    }
    else {
        rhs = "Fahrenheit";
    }
    // taken from header
    calculation = unitConversion(temperature, units);

    cout << "A temperature of " << temperature << " degrees " << lhs << " is equivalent to " << calculation << " degrees " << rhs << ". \n";
}

当我运行问题时，如果我为第一个输入输入一个字符并点击 cin.fail 逻辑，我只会得到以下输出：

This program converts Temperatures from Fahrenheit to Celsius and vice versa. 
Please enter your temperature: 
f

The value you have entered is incorrect or not supported. Would you like to try again? (Y/N): 
Too many incorrect attempts. Exiting program now. 
Thank you. Goodbye. 

应该发生的事情是它挂起并等待我输入另一个值以确认我想如何进行。