在读取文件时显示额外的字符问题 [英] Displaying an extra character problem while reading a file

问题描述

我写了一个代码o计算文本文件中的字母数量并打印这些字母。

但是它总是打印一个额外的字母。假设在我的文件欢迎中，那么就是打印欢迎这样的，请帮助。

Hi,
I have written a code o count number of letters present in a text file and print that letters.
But it always prints an extra letter . Suppose in my File Welcome is there then it is printing Welcomee like this, kindly help.

#include <iostream>
#include <fstream>
#include<conio.h>;
using namespace std;
int main()
{//ifstream is a datatype which represents the input file stream which is used to read the data from the file
    ifstream file;
    //Open File with file name countletters.txt
	file.open("countletters.txt");
//n is an counter integer variable used to count the number of letters
//letter is an character variable
	int n=-1;
	char letter;
	int i;	
	//eof() is a function which represents when no file present to read the data from the file
			while(!file.eof())
			{file.get(letter);
			i=letter;
                if(i>64&&i<91||i>96&&i<123)
               {
                n++;   
		        cout << letter;
				}
            
            
            cout<<endl;
			}
		
//Display the number of letters present in the file	
cout << "the number of letters is :" << n << endl;
//file is closed
file.close();	
getch();
return 0;
} 

推荐答案

当code> EOF 标志未设置时最后一个字符已被读取，但在尝试读取下一个不可用的字符时。因此，您必须在阅读完字符后再打印出来之前检查 EOF 。



阅读字符并检查 EOF 可以在while条件下完成：

The EOF flag is not set when the last character has been read but when trying to read the next not available character. So you must check for EOF after reading a character and before printing it out.

Reading the character and checking for EOF can be done inside the while condition:

while (!file.get(letter).eof())
{
// ...
}

1。你需要将n初始化为零，而不是-1。

2.使用letter = file.get（）;而不是file.get（letter）;。

3.你对i> 64 && i< 91的测试包括'A'到'Z'所以为什么不这样写？

例如。 i> ='A'&& i< ='Z'... ditto fori> 96 && i< 123。

4.我注意到代码为每个角色打印一个空行读。不确定这是不是你的意图。



你会看到正确的计数，最后没有额外的字符。

1. You need to initialize "n" to zero, not -1.
2. Use "letter = file.get();" instead of "file.get(letter);".
3. Your test for "i>64&&i<91" includes 'A' through 'Z' so why not write it that way?
eg. "i >= 'A' && i <= 'Z' ... ditto for "i>96&&i<123".
4. I noticed the code prints a blank line for every character read. Not sure if that was your intent.

You will see the correct count AND no extra character at the end.

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