16進数文字列 -> long

[todanano@localhost tmp]$ vi a.cpp
[todanano@localhost tmp]$ cat a.cpp

#include <stdio.h>
#include <stdlib.h>
#include <string>

int main( int argc, char **argv ) {

        std::string str = "FF";
        long num = strtol( str.c_str(), NULL, 16 );
        printf( "%ld\n", num );

        return( 0 );

}

[todanano@localhost tmp]$
[todanano@localhost tmp]$ g++ ./a.cpp
[todanano@localhost tmp]$ ./a.out
255
[todanano@localhost tmp]$
[todanano@localhost tmp]$

息抜きにちょろっと書いただけです。はい。