多种方式实现两个开关控制led灯 c语言程序

在C语言中，你可以通过结构体、函数指针或者联合体来实现两个开关分别控制LED灯的功能。这里简单给出几种方法：

**方法一：使用结构体**

#include <stdio.h>
typedef struct {
    int ledState;
    void (*switchAction)(void);
} LedControl;

void switchOn() {
    printf("Switch 1 is on, turning LED on.\n");
}

void switchOff() {
    printf("Switch 1 is off, turning LED off.\n");
}

int main() {
    LedControl light = {0, NULL}; // 初始状态关闭
    light.switchAction = switchOn; // 设置初始切换动作

    while (1) {
        if (getchar() == '1') { // 用户输入1开启，2关闭
            light.switchAction = switchOn;
        } else if (getchar() == '2') {
            light.switchAction = switchOff;
        }
        light.switchAction(); // 执行当前开关动作
    }
    return 0;
}

**方法二：使用函数指针**

#include <stdio.h>

void switchLedOn() {
    printf("Switch 2 is on, turning LED on.\n");
}

void switchLedOff() {
    printf("Switch 2 is off, turning LED off.\n");
}

int main() {
    void (*ledActions[])(void) = {NULL, &switchLedOn, &switchLedOff};
    int currentActionIndex = 0;

    while (1) {
        char input;
        scanf("%d", &input);
        if (input == 1) {
            ledActions[currentActionIndex] = switchLedOff;
        } else if (input == 2) {
            ledActions[currentActionIndex] = switchLedOn;
        }
        ledActions[currentActionIndex](); // 执行当前操作
        currentActionIndex = (currentActionIndex + 1) % 3; // 循环切换
    }
    return 0;
}

**方法三：使用联合体+位运算**

#include <stdio.h>
union LedState {
    unsigned char byte;
    struct {
        unsigned char switch1 : 1;
        unsigned char switch2 : 1;
        unsigned char unused : 6;
    } bits;
};

void setLed(int switchNumber, int state) {
    union LedState led;
    led.bits.switch1 = switchNumber == 1 ? state : 0;
    led.byte |= (state << (switchNumber * 2)); // 高两位对应开关1和2
    printf("Switch %d: %s\n", switchNumber, state ? "on" : "off");
}

int main() {
    while (1) {
        int switchInput;
        scanf("%d", &switchInput);
        setLed(switchInput, 1); // 开启
        setLed(2 - switchInput, 0); // 关闭另一个
    }
    return 0;
}