《C++使用批量数据计算学生成绩》

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于 2018-11-05 10:02:44 发布 · 1.1k 阅读

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本文介绍了一个C++程序，用于根据期末、期中考试和家庭作业成绩计算学生的最终成绩。程序利用<ios>和<iomanip>库，通过setprecision控制输出精度，持续读取文件直到文件结束标志，采用double类型确保计算精度。

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设想有一个课程，学生的期末考试成绩占最终成绩的40%，期中考试成绩占20%，家庭作业的平均成绩占40%,下面这个程序便可以帮助学生计算他们的最终成绩：

#include<iostream>
#include<ios>
#include<iomanip>
#include<string>
using namespace std;
int main()
{
	//ask for and read the student's nname
	cout << "Please enter your first name:";
	string name;
	cin >> name;
	cout << "Hello," << name << "!" << endl;

	//ask for and read the midterm and final grades
	cout << "Please enter your midterm and final grades:";
	double midterm, final;
	cin >> midterm >> final;

	//ask for the homework grades
	cout << "Enter all your homework grades,"
		"followed by end-of-file:";

	//the number and sum of grades read so far
	int count = 0;
	double sum = 0;

	//a variable into which to read 
	double x;

	//invariant:
	//we have read count grades so far, and
	//sum is the sum of the first count grades
	while (cin >> x) {
		++count;
		sum += x;