Question

我的任务是关于数组和结构。我需要做的第一部分是从输入文件中读取数据。但是，我坚持这一点。我知道我有一些随机数字。但是，我无法找到它。我花了一个小时才发现这些错误。你能告诉我哪里弄错了吗？我会很感激。谢谢！！！

#include <iostream>
#include <fstream>
#include <string>

using namespace std;

const int SIZE=15;

// Here is my structure declaration.
struct BestColleges
{
    int rnk;        // The rank of college.
    string name;    //The college name.
    int years;      // Which years did college establish?
    string email;   // The address of college.
    double TranferRate; // % of students who graduate and transfer
    double RetentionRate;   // % of students who first year retention.
    int low_cost;       // The lower cost of attendance
    int high_cost;      // The higher cose of attendance
    double numStudents; // how many students in the college.
};

void getData (BestColleges c[], BestColleges *plast);
void printCollege1 (BestColleges College[],BestColleges *plast);

int main()
{
    ifstream inputFile;
    int num_college;

    cout << " Welcome to my program!!! " << endl;

    BestColleges *College;
    College = new BestColleges[SIZE];
    BestColleges *ptr;
    BestColleges *plast = College+ SIZE-1;
    ptr= College;

// Here is my function definition
    getData( College, plast);
    printCollege1( College, plast);


  // I'm testing if I got the data from input file
//cout << num_college << endl;



    cout << " Thank you for reading my program! See you again!" << endl;

    return 0;
}
// Here is my fuction definition
void getData (BestColleges c[], BestColleges *plast)
{
    ifstream inputFile;
    int num_college;

    inputFile.open("CA_BestColleges.txt");
    inputFile >> num_college;

    for ( BestColleges *p =c; p < plast; p++)
        {
            inputFile >> p->rnk;
            getline(inputFile,p->name);
            inputFile >> p->years;
            getline(inputFile,p->email);
            inputFile >> p->TranferRate;
            inputFile >> p->low_cost;
            inputFile >> p->high_cost;
            inputFile >> p->numStudents;

        }
        inputFile.close();
}
void printCollege1 (BestColleges c[],BestColleges *plast)
{

    for ( BestColleges *ptr = c; ptr < plast; ptr++) // Here is my printing entirely information.
            {
                cout << " Rank: " << ptr->rnk <<  endl;
                cout << " Name: " << ptr->name << endl;
                cout << " Email: " << ptr->email << endl;
                cout << " Graduation and Transfer Rate: " << ptr->TranferRate << endl;
                cout << " First Year Retention Rate: " << ptr->RetentionRate << endl;
                cout << " Cost of Attendance: " << "$" << ptr->low_cost << " - " << "$" << ptr->high_cost << endl;
                cout << " Number of Students: " << " approx. " << ptr->numStudents << endl;
                cout << endl;
            }
}

这是我的输入文件：

15
Palo Verde College
1947
http://www.paloverde.edu
31.2 82.7 14266 18266 3898
4
Diablo Valley College
1949
http://www.dvc.edu
50.2 90.5 14839 20579 24781
6
Foothill College
1957
http://www.foothill.edu
68.8 87.5 12300 19302 18362
12
College of the Siskiyous
1957
http://www.siskiyous.edu
59.8 82.0 15306 21936 2473
10
Cuesta College
1963
http://www.cuesta.edu
50.7 86.2 12052 19135 9571
8
Ohlone College
1965
http://www.ohlone.edu
52.1 91.1 10898 15878 18000

Answer 1

由于您无法正确解析，因此结果不佳：

for ( BestColleges *p =c; p < plast; p++)
    {
        inputFile >> p->rnk;
        getline(inputFile,p->name);
        inputFile >> p->years;
        getline(inputFile,p->email);
        inputFile >> p->TranferRate;
        inputFile >> p->low_cost;
        inputFile >> p->high_cost;
        inputFile >> p->numStudents;

    }

您错过了inputFile >> p->RetentionRate;。因此，下一个项目将读取意外数据并导致不良结果。

Answer 2

您有一次读取大学的数量，但它不在文件中，因此读入等级。其余的不同步之后。

我没有得到正确的数据。我只是随机数

2 个答案: