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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