error: no match for operator
 

Hey guys! I'm an extremely new c++ programmer. Can you offer suggestions on why I get the "no match for operator" error with the following code? I think it may be that my text file is too big for a string.

#include<iostream>
#include<string>
#include<vector>
#include<cmath>
#include<fstream>
#include<stdlib.h>



using namespace std;



int main(){

string line;
ifstream text( "text.txt" );
getline( text, line );
text.close();
//for( int i = 0; i < line.length(); i++ ){
// cout << line[ i ] << " ";
//}
cout << endl;

string P = "is";



long long int PRIME = atoll("10002949999");

int l_line = line.length(), l_P = P.length(), t=0, h = 1, d = 26, H = 0;

for (int i=1; i < l_P; i++)

h = (h * d) % PRIME;

for (int i=0;i<l_P;i++) {

H = ( (d*H) + P[i] - 'a')%PRIME ;

t = ( (d*t) + line[i] - 'a')%PRIME ;

}
for (int i = 0, j = l_line - l_P - 1 ; i < j ; i++){

if (t == H){

int state = 1;

for (int k = 0 ;k < l_P; k++)

if (line[i+k] != P[k]){

state = -1;

break;

}

if (state == 1 ){

cout << " Match found at index : " << i << "\n";

}

}

else{

t = ( (d * (t - h*(line[i]-'a')) + line[i+l_P] - 'a')%PRIME );

}

}

return 0;

}

What this means? And please use CODE tags around your code, and specify exact error message you get (with line number).

Well now it doesn't return an error. It returns nothing.

Doesn't that mean it compiled, then? You shouldn't edit your post to remove the problems you're asking about because when other people read the post they can't find evidence of the problem. You should also post complete error messages since they include the semantic information necessary to figure out where the problem is.
Kevin Barry