4-0.cpp

来自「Accelerated C++ 课后练习题 本人自己完成、可供参考」· C++ 代码 · 共 54 行

#include<algorithm>
#include<iomanip>
#include<ios>
#include<iostream>
#include<stdexcept>
#include<string>
#include<vector>
#include"grade.h"
#include"Student_info.h"

using namespace std;

string::size_type max(const string::size_type a,const string::size_type b)
{
	return a>b?a:b;
}

int main()
{
	vector<Student_info> students;
	Student_info record;
	string::size_type maxlen=0;         //the length of the longest name
	//read and store all the stuedent data.
	//Invariant: student contains all the strdent records read so far
	//maxlen contains the length of the longest name in students
	for(vector<Student_info>::size_type i=0;i!=students.size();++i)
	{
		while(read(cin,record))
		{
			//find length of longest name
			maxlen = max(maxlen, record.name.size());

			students.push_back(record);
		}
	
		//alphabetize the student records
		sort(students.begin(),students.end(),compare);
	
		//write the name and grade
		try
		{
			double final_grade=grade(students[i]);
			streamsize prec=cout.precision();
			cout<<setprecision(3)<<final_grade<<setprecision(prec);
		}
		catch(domain_error e)
		{
			cout<<e.what();
		}
		cout<<endl;
	}

	return 0;
}