First open an ifstream to open your file then check for the string:
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
int main () {
string line;
ifstream myfile ("example.txt");
if (myfile.is_open())
{
while ( getline (myfile,line) )
{
if(line.find("the string to find") != string::npos)
{
//line found, do something
}
}
myfile.close();
}
else cout << "Unable to open file";
return 0;
}
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solved How do you make a c++ program search for a string? [closed]