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@xxxxxxxxxxx [mailto:gcc-help-owner@xxxxxxxxxxx]On Behalf Of learning c++ Sent: Wednesday, September 01, 2004 2:23 PM To: gcc-help@xxxxxxxxxxx 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 _________________________________________________________________ The new MSN 8: advanced junk mail protection and 2 months FREE* http://join.msn.com/?page=features/junkmail
