傻子都能理解的C语言十六进制转二进制参考方法（范围0~0xFF）

原理：十六进制的0~F其实分别对应二进制的0000到1111，所以我们只要事先在二维数组定义好其对应值就行了，放代码:

1.c

#include <stdio.h>

int main(){
    
    	
	//binValue存放的是0~F的对应值,最后用索引提取就行
	char binValue[16][5] = {
    
    "0000","0001","0010","0011",\
							"0100","0101","0110","0111",\
							"1000","1001","1010","1011",\
							"1100","1101","1110","1111"};
	unsigned char a = 0x78;	//用来测试的值
	unsigned char H4 = 0;	//高四位值
	unsigned char L4 = 0;	//低四位值
							
	H4 = a/16;	// 计算高四位值
	L4 = a%16;	// 计算低四位值
	
	printf("%s%s\n", binValue[H4], binValue[L4] ); //输出结果
							
}

gcc 1.c -o 1.exe
.\1.exe

结果：

01111000