文本文件需要2D阵列指导

时间:2014-04-19 20:51:12

标签: visual-c++ switch-statement text-files multidimensional-array

该程序需要读取文本文件:

Amy 100 100 90 95 85 100 90 100 100 98 75

Bob 90 92 82 95 89 93 95 97 96 98 92

Nina 100 90 95 85 100 65 75 95 100 90 60

Eva 98 90 95 85 100 90 90 95 100 90 82

Matt 100 100 90 95 85 75 85 90 95 100 78

Shiva 90 90 95 100 75 100 100 90 92 82 68

然后提示用户使用switch语句选择一个名称,并为输入的选项提供最高和最低等级。

这就是我一直在努力的方面。

如何允许我的switch语句从数组中获取信息?另外“我得到格式错误(文件>> name [])

使用namespace std;

void PrintLines(int numlines); //为边框“*”

int main()

{

cout.setf(IOS ::固定);

cout.setf(IOS :: showpoint);

cout.precision(2);

ifstream文件;

ofstream文件;

file.open( “gradename.txt”);

如果(file.fail())

{

COUT<< (“无法打开文本”);

//系统( “暂停”);

返回1;

}

字符串名称[6]; //用于存储名称的数组

int scores [6] [11]; //数组来存储分数

int x,y;

for(int x = 0; x< 6; x ++)

{

文件>>名[X]; //更改此错误?

for(int y = 0; y< 11; y ++)

file>>分数[X] [Y];

}

{

int number = 0;

double ave = 0.0;

double sum = 0;

int count = 0;

int max = 0;

int min = 100;

int selection = 0;

while(!file.eof())

{

if(count!= 0)

{

如果(数>最大)

最大=数目;

如果(数

分钟=数目;

}

和+ =数目;

计数+ = 1;

文件>>数;

}

ave = sum /(count-1);

////计算结束

int numlines = 0; //初始化新变量以打印*

COUT<< “\ n你要打印多少行*”<

CIN>> numlines;

PrintLines(numlines);

cout<<“\ n \ n你希望看到谁的成绩\ n 为Amy输入1,为Bob输入2或为Nina输入3,

4为Eva,5为Matt或6为Shiva .... \ n“<< endl; //用户的选择

切换(选择)

{

案例1:

cout<< “Amy's \ n最高等级是:”<< max<< “\ n最低等级:”<< min<< “\ n平均等级:”<< ave<< “\ n” 个;

中断;

案例2:

cout<< “鲍勃的\ n最高等级是:”<< max<< “\ n最低等级:”<< min<< “\ n平均等级:”<< ave<< “\ n” 个;

中断;

案例3:

cout<< “Nina的\ n最高等级是:”<< max<< “\ n最低等级:”<< min<< “\ n平均等级:”<< ave<< “\ n” 个;

中断;

案例4:

cout<< “Eva's \ n最高等级是:”<< max<< “\ n最低等级:”<< min<< “\ n平均等级:”<< ave<< “\ n” 个;

中断;

案例5:

cout<< “Matt's \ n最高等级是:”<< max<< “\ n最低等级:”<< min<< “\ n平均等级:”<< ave<< “\ n” 个;

中断;

案例6:

cout<< “Shiva's \ n最高等级是:”<< max<< “\ n最低等级:”<< min<< “\ n平均等级:”<< ave<< “\ n” 个;

中断;

默认:

cout<< “\ n无效\ n”;

中断;

}

cout<< “你要打印多少行*”<< ENDL;

cin>> numlines;

PrintLines(numlines);

}

file.close(); //关闭文件

系统( “暂停”);

返回0;

}

void PrintLines(int numlines)//包含*

输出的函数

{

for(int count = 1; count< = numlines; count ++)

cout<< “的 ********************************************** ********************** “<< ENDL;

}

1 个答案:

答案 0 :(得分:0)

试试这段代码。注意:我假设您的文件如下所示:

Amy 100 100 90 95 85 100 90 100 100 98 75
Bob 90 92 82 95 89 93 95 97 96 98 92
Nina 100 90 95 85 100 65 75 95 100 90 60
Eva 98 90 95 85 100 90 90 95 100 90 82
Matt 100 100 90 95 85 75 85 90 95 100 78
Shiva 90 90 95 100 75 100 100 90 92 82 68

现在代码:

#include <iostream>
#include <fstream>
#include <vector>
#include <algorithm>
#include <map>
#include <numeric>

using namespace std;

void PrintLines (int numlines); //for the border "*"

int main( )

{

    cout.setf(ios::fixed);
    cout.setf(ios::showpoint);
    cout.precision(2);

    ifstream file;

    //ofstream file;

    file.open("Path to your file\\gradename.txt");

    if(file.fail()) {
        cout<< ("cant open text");
        return 1;
    }

    map<string, vector<int> > scores; //[6][11]; //array to store the scores

    for (int x = 0; x < 6; ++x) {

        string name;
        file >> name; //change this error?

        vector<int> scoresOfName;
        for(int y = 0; y < 11; y++) {
            int score;
            file >> score;
            scoresOfName.push_back(score);
        }
        scores[name] = scoresOfName;
    }

    {


        int numlines;
        cout<< "\nHow many lines of * do you want to print"<

        cin >> numlines;

        PrintLines(numlines);

        cout<<"\n\n Whose grades would you like to see\n Enter 1 for Amy, 2 for Bob or 3 for Nina,4 for Eva, 5 for Matt or 6 for Shiva.... \n "<< endl; // User's choice
        int selection;
        cin >> selection;
        string chName = "";
        switch(selection)
        {
        case 1:
            chName = "Amy";
            break;
        case 2:
            chName = "Bob";
            break;
        case 3:
            chName = "Nina";
            break;
        case 4:
            chName = "Eva";
            break;
        case 5:
            chName = "Matt";
            break;
        case 6:
            chName = "Shiva";
            break;
        default:
            cout << "\n Invalid input\n";
            break;
        }

        cout << "Your choice is " << chName;


        cout << "\n" << chName << "'s\n Highest grade is:"
             << *(max_element(scores[chName].begin(), scores[chName].end()))
             << "\nLowest grade:"
             << *(min_element(scores[chName].begin(), scores[chName].end()))
             << "\nAverage grade:"
             << accumulate(scores[chName].begin(), scores[chName].end(), 0) / 10
             << "\n";



        cout << "How many lines of * do you want to print" << endl;
        cin >> numlines;
        PrintLines(numlines);

    }

    file.close(); //closing file

    cin.get();

    return 0;

}

void PrintLines(int numlines) //function that contains the output for *

{
    for (int count =1; count <=numlines; count++)
        cout << "********************************************************************" << endl;
}