error: no match for `std::string& != long int' operator

Lev Assinovsky LAssinovsky@algorithm.aelita.com
Wed Sep 1 10:38:00 GMT 2004


Sorry, but you code is wrong.
string is a class name and s1 is an object.
You can't apply != NULL or ++ unless 
these operators are declared by basic_string.
As far as I know basic_string doesn't have those operators.

-----Original Message-----
From: gcc-help-owner@gcc.gnu.org [mailto:gcc-help-owner@gcc.gnu.org]On
Behalf Of learning c++
Sent: Wednesday, September 01, 2004 2:23 PM
To: gcc-help@gcc.gnu.org
Subject: error: no match for `std::string& != long int' operator


Hi,
I have a short code hope to print the character of a string one by one. but 
there are some errors.

if I declare srting s1, is s1 a pointer? are there some difference between C 
and C++?
#include <iostream>
#include <string>

using namespace std;

int main(){

string s1("0123456789abcdefghijklmnopqrstuvwxyz");
for(s1; s1!=NULL; ++s1)
cout <<*s1<<" " <<int(*s1)<<"  ";

return 0;

}
printc.cpp: In function `int main()':
printc.cpp:9: error: no match for `std::string& != long int' operator
printc.cpp:9: error: no match for `++ std::string&' operator
printc.cpp:10: error: no match for `* std::string&' operator
printc.cpp:10: error: no match for `* std::string&' operator
printc.cpp:9: warning: statement with no effect

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