c++ - 如何循环程序的某些方面

Question

我正在尝试根据用户为 n 输入的内容循环分配分数和总分。我一直在四处搜索，只是发现了一些问题，这就是目前与 int i 变量的整个处理过程。我无法让事情正常循环，现在这甚至无法编译，因为我在那里有那个讨厌的 i 。您取出 i 并且程序运行正常，但 n 输入没有任何变化。

/**
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。

并且您应该使用 <=，两个字符之间没有任何空格。

编辑:正如您在这里看到的: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;
}