Question

我创建了一个程序，允许用户输入他们想要求和的总数，但我能够得到它但是当用户再次运行时，它会在应该重新启动时添加到前一个总和并添加新的整数

#include "stdafx.h"
#include <iostream>
#include <string>

using namespace std;
//  ================

int main() {
    // Declared Variables 
    int num;
    int sum;
    int total = 0;
    char ans = 'y';

    //  ===========

    using namespace std; 
    // While loop which allows user to go again.
    while (ans == 'y' || ans == 'Y')
    {
        // Input for adding any number of integers 
        cout << "How many integer values would you like to sum? ";
        cin >> num;
        cout << endl;
        //  =========

        //  For Loop allows to add integers 
        for (int i = 0; i < num; i++)
        {
            cout << "Enter an integer value: ";
            cin >> sum;
            total += sum;


        }  // End for loop
        //  ==============

        //  Prints out the sum of the numbers 
        cout << "The sum is " << total << endl;
        cout << endl;

        // Asks the user if they want to go again
        cout << "Would you like to go again (y/n)? ";
        cin >> ans;
        cout << endl; 

        if (ans != 'y')
        {
            cout << "Bye..." << endl;
        }// End If statement
        //  ================

    }//  End while loop
    //  ==============

    cout << endl;
    return 0;  
}  // Function main()
//  =================

Answer 1

在while循环中移动此行：

int total = 0;

即：

while (ans == 'y' || ans == 'Y')
{
    int total = 0;

    // Input for adding any number of integers 
    cout << "How many integer values would you like to sum? ";
    ...

Answer 2

在你的while循环开始时：

total = 0;

这是一个更短，更改的代码版本。

int main()
{
    char ans;

    do {
        int n, sum = 0;        

        std::cout << "Enter the number of numbers\n";
        std::cin >> n;
        while (--n >= 0) {
            int x;
            std::cout << "Number? ";
            std::cin >> x;

            sum += x;
        }
        std::cout << "Sum is " << sum << "\nGo again?(y/n)\n";
        std::cin >> ans;
    } while (ans == 'y' || ans == 'Y');

    std::cout << "Bye\n";
    return 0;
}

数字保持总和，但不会停止求和

2 个答案: