如何在C ++中替换文本文件中的单词？ [英] How Do I Replace A Word In A Text File In C++?

问题描述

我正在尝试在文本文件中找到替换它的单词。现在，我可以在文本文件中找到成功的单词，但我无法替换它。任何人都可以建议我在哪里犯了错误。谢谢。

I am trying to find a word an replace it in the text file. Now, i can find the word successfully in the text file but i am unable to replace it. Can anyone please suggest me where i made the mistake. Thanks.

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

using namespace std;

int main(){
ifstream input;
ofstream output;
output.open("Book1.txt",ios::app);

int choice;
size_t pos;
size_t p;
string line;
string a;
string id;
cout<<"enter the name you want to search"<<endl;
cin>>a;

string replace = "hello";
size_t len = a.length();
input.open("Book1.txt",ios::out);
if(input.is_open())
{
while(getline(input,line))
{
pos = line.find(a);
if(pos!=string::npos)
{

line.replace(pos,len,replace);

cout<<"Name://IDnumber//Account-Balance"<<" "<<line<<endl;


}
}
}

system("pause");

}

推荐答案

读取字符串中的整个文件并使用replace 。



检查所有字符串是否已被替换，而不是写新的字符串到文件

read the whole file in a string and use replace.

Check that all strings are replaced and than write the new string to the file

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