Question

怎么编写一个简单的输出二进制的程序

我想编写一个输出二进制的程序，可是我不知道有没有输出二进制的格式化字符，C语言

Answer 1

Here is a quick hack to demonstrate techniques to do what you want.

#include <stdio.h> // printf
#include <string.h> // strcat
#include <stdlib.h> // strtol

const char *byte_to_binary
(
int x
)
{
static char b[9] = {0};

int z;
for (z = 256; z > 0; z >>= 1)
{
strcat(b, ((x & z) == z) ? "1" : "0");
}

return b;
}

int main(void)
{
{
// binary string to int

char *tmp;
char *b = "0101";

printf("%d\n", strtol(b, &tmp, 2));
}

{
// byte to binary string

printf("%s\n", byte_to_binary(5));
}

return 0;
}