将 1 和 0 的字符串转换为二进制值 [英] Converting string of 1s and 0s into binary value

问题描述

我正在尝试将来自标准输入的 1 和 0 的传入字符串转换为它们各自的二进制值(其中诸如11110111"之类的字符串将转换为 0xF7).这似乎很简单，但我不想重新发明轮子，所以我想知道 C/C++ 标准库中是否有任何东西可以执行这样的操作?

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?

推荐答案

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

int main(void) {
    char * ptr;
    long parsed = strtol("11110111", & ptr, 2);
    printf("%lX
", parsed);
    return EXIT_SUCCESS;
}

对于较大的数字，有一个 long long 版本，strtoll.

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

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