Question

I’m trying to convert an incoming sting of 1s and 0s from stdin into their respective binary values (where a string such as ‘11110111’ would be converted to 0xF7). This seems pretty trivial but I don’t want to reinvent the wheel so I’m wondering if there’s anything in the C/C++ standard libs that can already perform such an operation?

Answer 1

#include <stdio.h> #include <stdlib.h>  int main(void) {     char * ptr;     long parsed = strtol('11110111', & ptr, 2);     printf('%lX\n', parsed);     return EXIT_SUCCESS; } 

For larger numbers, there as a long long version, strtoll.