C语言中位运算怎么操作C语言位运算的实际应用案例

#include <stdio.h>

// 定义权限
#define READ    1  // 00000001
#define WRITE   2  // 00000010
#define EXECUTE 4  // 00000100

int main() {
    int user_permissions = READ | WRITE; // 用户具有读和写权限

    // 检查用户是否具有读权限
    if (user_permissions & READ) {
        printf("User has READ permission.\n");
    }

    // 检查用户是否具有执行权限
    if (user_permissions & EXECUTE) {
        printf("User has EXECUTE permission.\n");
    } else {
        printf("User does not have EXECUTE permission.\n");
    }

    return 0;
}

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

int main() {
    uint32_t pixel = 0xAABBCCDD; // 假设像素格式为 0xAARRGGBB

    // 提取红色通道 (RR)
    uint8_t red = (pixel >> 16) & 0xFF;

    // 提取绿色通道 (GG)
    uint8_t green = (pixel >> 8) & 0xFF;

    // 提取蓝色通道 (BB)
    uint8_t blue = pixel & 0xFF;

    printf("Red: 0x%X\n", red);
    printf("Green: 0x%X\n", green);
    printf("Blue: 0x%X\n", blue);

    return 0;
}

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

void process_data(uint8_t *data, size_t len) {
    for (size_t i = 0; i < len; i += 4) {
        // 确保不会越界
        if (i + 3 < len) {
            uint32_t combined_data = (data[i] << 24) | (data[i + 1] << 16) | (data[i + 2] << 8) | data[i + 3];
            // 在这里处理 combined_data
            printf("Combined data: 0x%X\n", combined_data);
        } else {
            // 处理剩余的字节
            for (size_t j = i; j < len; j++) {
                printf("Remaining byte: 0x%X\n", data[j]);
            }
        }
    }
}

int main() {
    uint8_t data[] = {0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xAA};
    size_t len = sizeof(data) / sizeof(data[0]);
    process_data(data, len);
    return 0;
}