我的任务需要帮助 . 我不允许使用除循环之外的任何函数,if语句,cout,cin,基本运算符和基本字符串 . 不允许使用数组 . 我需要按字母顺序对文件中的名称列表进行排序,并输出哪些名称将位于行的前面和后面 . 但是,当我尝试运行我的代码时,它会在它读取文件的部分停止 . 该文件位于正确的位置,因为我已经用cout测试了它 . 我无法弄清楚我做错了什么 . 任何帮助,将不胜感激!下面是代码:
#include<iostream>
#include<string>
#include<fstream>
using namespace std;
int main()
{
//Intialize variables
string studentName;
string firstEntry;
string secondEntry;
string first;
string last;
ifstream inputFile;
string filename;
int students;
//Ask for amount of students
cout << "Please enter the number of students in the class.\n(The number must be a whole number between 1 and 25.)\n";
cin >> students;
//Input validation
while (students < 1 || students > 25)
{
cout << "\nInvalid value. Please enter a value between 1 and 25.\n";
cin >> students;
}
//Get file name from user
cout << "Please enter the name of the file with the list of students\n";
cin >> filename;
//Open the file
inputFile.open(filename);
if (inputFile)
{
while (inputFile >> studentName)
{
cin >> studentName;
studentName = firstEntry;
cin >> studentName;
studentName = secondEntry;
do
{
if (firstEntry < secondEntry)
{
firstEntry = first;
secondEntry = last;
}
else
{
firstEntry = last;
secondEntry = first;
}
} while (students = 30);
if (firstEntry < first)
firstEntry = first;
if (secondEntry < first)
secondEntry = first;
if (firstEntry > last)
firstEntry = last;
if (secondEntry > last)
secondEntry = last;
}
cout << first << " is the first student in line.";
cout << last << " is the last student in line.";
}
else
{
cout << "Error opening the file.\nPlease restart the program and try again.";
return 1;
}
inputFile.close();
return 0;
}
2 回答
这就是你的程序停止的原因 . 它等着你在键盘上输入一些东西 . (cin是C中的标准输入)
我真诚的建议是永远使用笔和纸,并首先记下你的要求 . 在此基础上写下算法并将该算法转换为代码 . 不幸的是,你在你的代码中做了什么都是错的 . 只是深入思考你在代码中做了什么,特别是在代码下面: -
如果你仔细考虑这一切,你就会明白你的所有错误 .
希望对你有帮助..