如何在C/C++中读/写任意位

#include<stdio.h>
#include <stdint.h>

int main() {
    uint32_t data = 0x12345678;
    uint8_t* ptr = (uint8_t*)&data;

    printf("Data: 0x%08X\n", data);
    printf("Byte 0: 0x%02X\n", ptr[0]);
    printf("Byte 1: 0x%02X\n", ptr[1]);
    printf("Byte 2: 0x%02X\n", ptr[2]);
    printf("Byte 3: 0x%02X\n", ptr[3]);

    ptr[0] = 0xAB;
    ptr[1] = 0xCD;
    ptr[2] = 0xEF;
    ptr[3] = 0x12;

    printf("Data: 0x%08X\n", data);

    return 0;
}