C++ 文件 I/O 和指针

Question

我尝试创建一个使用输入文件“cardList.txt”的程序，该文件包含：

Schmidt, Helga
Alvarez, Ruben
Zowkowski, Aaron
Huang, Sun Lee
Einstein, Beverly

我想按姓氏的字母顺序对其进行排序。

主要：

#include <iostream>
#include <fstream>
#include <string>
#include "insertsortFunct.h"
using namespace std;

int main(void){
    ifstream inData;
    ofstream outData;
    const int listSize = 5;
    char cardList[listSize][25];
    instruct();
    openFile(inData, outData);
    buildList(cardList, inData);
    inData.close();
    sortList(cardList, listSize);
    cout << endl << "Your list is sorted" << endl;
    writeFile(cardList, outData);
    outData.close();
    return 0;
}

我在一个单独的文件中定义了这些函数：

#include "insertsortFunct.h"
#include <iostream>
#include <fstream>
#include <string>
#include <cstdlib>
using namespace std;

void instruct(void){
    cout << "The program insertSort.cpp reads the file, cardList.txt " <<
        "into an array and" << endl;
    cout << "sorts the array using the selection sort algorithm." << endl;
    cout << "The sorted array is written to a file named cardList.srt." <<
        endl;
}

void openFile(ifstream& inputFile, ofstream& outputFile){
    inputFile.open("cardsList.txt");
    if(!inputFile.is_open())
        exit(1);
    outputFile.open("cardsList.srt");
    if(!outputFile.is_open())
        exit(1); 
}

void buildList(char (*array)[25], ifstream& inputFile){
    for (int i = 0; i < 5; i++)
        inputFile >> array[i];
}

void sortList(char (*list)[25], int length){
    int firstOutOfOrder, location;
    char temp[25];
    for (firstOutOfOrder = 1; firstOutOfOrder < length; firstOutOfOrder++){
        location = firstOutOfOrder;
        while ( location > 0 && list[location - 1] > list[location]){
            temp[25] = list[location][25];
            list[location][25] = list[location - 1][25];
            list[location - 1][25] = temp[25];
            location--;
        }
    }
}

void writeFile(char (*array)[25], ofstream& outputFile){
    for (int i = 0; i < 5; i++)
        outputFile << array[i];
}

但是我的程序只打印instruct(); 语句，似乎没有其他任何事情发生。该程序应该使用排序列表创建一个文件 cardList.srt 并且编译后不会出现在我的目录中。

Answer 1

inputFile.is_open() 或 outputFile.is_open() 返回 false，因此调用了 exit()。