Converting string of 1s and 0s into binary value

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.

Answer 2

You can use std::bitset (if then length of your bits is known at compile time)
Though with some program you could break it up into chunks and combine.

#include <bitset> #include <iostream>  int main() {     std::bitset<5>  x(std::string("01011"));      std::cout << x << ":" << x.to_ulong() << std::endl; }