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Old 10-09-2011, 04:43 PM   #1
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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.


using namespace std;

int main(){

string line;
ifstream text( "text.txt" );
getline( text, line );
//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;



if (state == 1 ){

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




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



return 0;


Last edited by hollyj; 10-09-2011 at 04:52 PM.
Old 10-09-2011, 04:49 PM   #2
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What this means?
cin >> "is"
And please use CODE tags around your code, and specify exact error message you get (with line number).
Old 10-09-2011, 04:50 PM   #3
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Well now it doesn't return an error. It returns nothing.
Old 10-09-2011, 05:38 PM   #4
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Distribution: FreeBSD 9.1, Kubuntu 12.10
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Originally Posted by hollyj View Post
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
1 members found this post helpful.


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