Question

我有以下代码

for (int i = 0; i < courses; i++) 
{
    cout << "Please Enter Letter Grade: ";
    cin >> grade1;

    cout << "Please Enter Course Weighting: ";
    cin >> weight1;
}

现在，可以说循环运行了3次，并且用户为grade1和weight1输入的值每次都不同。我想存储这些不同的值，以便可以对它们进行一些计算。我将如何进行呢？

Answer 1

这里是使用数组的方式：

int grade[courses]; // this is an array with size of courses
double weight[courses];
for (int i = 0; i < courses; i++) {
    cout << "Please Enter Letter Grade: ";
    cin >> grade[i];

    cout << "Please Enter Course Weighting: ";
    cin >> weight[i];
}

数组是顺序存储在计算机内存中的相同类型数据的集合。数组的语法如下：

<type> <name>[<size>];

例如

int numberOfStudents[100];

是int数组，最多包含100个元素。

H 操作 T 他的 H 后腿

Answer 2

将grade和weight分组为struct，并将它们存储在vector中。

代码：（不处理所有潜在的错误）

#include <iostream>
#include <vector>

struct grade_weight
{
    int grade;
    int weight;
};

int main()
{
    int courses = 5;
    std::vector<grade_weight> result; 

    // potential optimization if you want
    //result.reserve(courses);   

    for (int i = 0; i < courses; i++) 
    {
        int grade, weight;

        std::cout << "Please Enter Letter Grade: ";
        std::cin >> grade;

        std::cout << "Please Enter Course Weighting: ";
        std::cin >> weight;

        result.push_back({grade, weight});
    }

    std::cout << "you input\n";
    for(auto& gw: result)
    {
        std::cout << "grade: " << gw.grade << ", weight: " << gw.weight << '\n'; 
    }
}

如何存储用户输入到for循环中的值？

2 个答案: