Question

我试图根据用户输入n的内容来循环分配分数和总计。我一直在寻找并且只是打击哑弹，这就是目前int i变量的整体处理。我无法正确循环，现在这甚至无法编译，因为那里有令人讨厌的i。你取出i，程序运行正常，但n输入没有变化。

/**
File: project_2_14.cpp
Description: Write a program that calculates the total grade for N classroom exercises as a percentage. The user should input the value for N followed by each of the N scores and totals. Calculate the overall percentage (sum of the total points earned divided by the total points possible.) and output it as a percentage. Sample input and output is shown below.
Created: Friday, September 11th, 2015
Author: 
email: 
*/

#include<iostream>
#include<vector>

using namespace std;

int main() 
{

    float s;  // assignment score
    float t;  // total points worth
    float p;  // percentage     
    int n = 0;

    //input the number of assignments

    cout << "How many assignments are there? " << endl;
    cin >> n;

        for (int i=0; i < =n; i++)
        {


    //input the total points earned for assignment
    cout << "What is the score earned for this assignment? ";
    cin >> s;


    //input the number of points assignment is worth
    cout << "How many points was the assignment worth? ";
    cin >> t;

    //calculate percentage
    p = (s / t)*100;
        }


    //output score

    cout.setf(ios::fixed);
    cout.setf(ios::showpoint);
    cout.precision(2);
    cout << "Total score: " << p << "%"<< endl;

    return 0;
}

Answer 1

你应该删除int n = 0;它应该只是int n。

你应该使用＆lt; =，两个字符之间没有任何空格。

编辑：正如您在此处所见：http://ideone.com/SeNum8它已经正确循环：）

#include<iostream>
#include<vector>

using namespace std;

int main() 
{

    float s;  // assignment score
    float t;  // total points worth
    float p;  // percentage     
    int n;

    //input the number of assignments

    cout << "How many assignments are there? " << endl;
    cin >> n;

        for (int i=0; i <=n; i++)
        {


    //input the total points earned for assignment
    cout << "What is the score earned for this assignment? ";
    cin >> s;


    //input the number of points assignment is worth
    cout << "How many points was the assignment worth? ";
    cin >> t;

    //calculate percentage
    p = (s / t)*100;
        }


    //output score

    cout.setf(ios::fixed);
    cout.setf(ios::showpoint);
    cout.precision(2);
    cout << "Total score: " << p << "%"<< endl;

    return 0;
}

如何循环程序的某些方面

1 个答案: