是否有以二进制格式打印的 printf 转换器? [英] Is there a printf converter to print in binary format?

问题描述

我可以使用 printf 作为十六进制或八进制数打印.是否有格式标签可以打印为二进制或任意基数?

I can print with printf as a hex or octal number. Is there a format tag to print as binary, or arbitrary base?

我正在运行 gcc.

printf("%d %x %o
", 10, 10, 10); //prints "10 A 12
"
print("%b
", 10); // prints "%b
"

推荐答案

Print Binary for Any Datatype

// Assumes little endian
void printBits(size_t const size, void const * const ptr)
{
    unsigned char *b = (unsigned char*) ptr;
    unsigned char byte;
    int i, j;
    
    for (i = size-1; i >= 0; i--) {
        for (j = 7; j >= 0; j--) {
            byte = (b[i] >> j) & 1;
            printf("%u", byte);
        }
    }
    puts("");
}

测试:

int main(int argv, char* argc[])
{
    int i = 23;
    uint ui = UINT_MAX;
    float f = 23.45f;
    printBits(sizeof(i), &i);
    printBits(sizeof(ui), &ui);
    printBits(sizeof(f), &f);
    return 0;
}

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