Question

#include <iostream>
#include <string>
#include <iomanip>
#include <fstream>
#include <stdio.h>
using namespace std;
int second();
main(){
    char myWord[5][20]={second()};
    int x;
    char c;
    ifstream fin;
    ofstream fout;

    fin.open("Palinput.txt");
    fout.open("Paloutput.txt");

    for(int row=0;row < 5;row++)
    {
        for(int col=0;col < 20 ;col++){
            cout<<myWord  [row][col];   

    }
int i, j, flag=0, n ='\0'-1;
for (i=0, j=n; i<j; i++,j--)

statement:
if (myWord[i]!=myWord[j])
{
    flag=0;
    break;
}
else
{
    flag=1;
}
if (flag)
cout<<myWord<<" pallindrome \n ";
else
cout<<myWord<<" not palindrome \n ";
        }

    return 0;
}
int second(){
    ofstream thefile("Palinput.txt");
    cout<<"Press enter after each word entered!\n";
    cout<<"Enter 5 string \n"<<endl;

    string txt;
int a;
for(a=0;a<=4;a++)
{
    cin>>txt;   
}
cout<<"Press ctrl+z to continue\n";
}

Answer 1

如果你正确地缩进了东西，许多事情变得明显，并且更容易追踪正在发生的事情。看到我的一些评论我添加到下面的你的代码。但一般概述是你要求输入但从不存储它们，只是覆盖它们。然后你尝试检查一个空的char [] []，通过比较它的行与它的列来查看它是否是一个回文。您的代码存在重大问题。你应该使用像visual studio或gdb这样的调试器来逐步查看代码，看看发生了什么。这样你就可以理解你在代码设计中犯了什么错误。

#include <iostream>
#include <string>
#include <iomanip>
#include <fstream>
#include <stdio.h>
using namespace std;
int second();
main()
{
    char myWord[5][20]={second()};//this isnt assigning to myWord
    int x;
    char c;
    ifstream fin;
    ofstream fout;

    fin.open("Palinput.txt");//opening file but not doing 
    fout.open("Paloutput.txt");//anything with it

    for(int row=0;row < 5;row++)
    {
        for(int col=0;col < 20 ;col++)
        {
            cout<<myWord  [row][col];//myWord has nothing in it

        }
        int i, j, flag=0, n ='\0'-1;
        for (i=0, j=n; i<j; i++,j--) //unused for loop

        statement: //unused label
        if (myWord[i]!=myWord[j])//how is a row=column? always true
        {
            flag=0;
            break;
        }
        else
        {
            flag=1;
        }
        if (flag)
            cout<<myWord<<" pallindrome \n ";
        else
            cout<<myWord<<" not palindrome \n ";
    }

    return 0;
}
int second()
{
    ofstream thefile("Palinput.txt"); //file never opened 
    cout<<"Press enter after each word entered!\n";
    cout<<"Enter 5 string \n"<<endl;

    string txt;
    int a;
    for(a=0;a<=4;a++)
    {
        cin>>txt; //simply overwriting a variable with new input
                  //without using the input
    }
    cout<<"Press ctrl+z to continue\n";
}

我必须使用2D阵列检查回文，我已经使用过文件，但它不起作用

1 个答案: