如何不重复 if 语句并允许它以某种方式查找它们？我很新，我确定这是基本的

Question

我是新手，想知道是否有办法让代码查找 if 语句，而不必复制并通过它们

也非常感谢关于如何清理它的任何其他提示，而不是一个严肃的项目，只是玩弄和尝试学习

此代码是在 mbed 上使用 Nucleo 开发板完成的以获得输出

#include "mbed.h" 
#include "../lib/uopmsb/uop_msb_2_0_0.h"
using namespace uop_msb_200;

Buzzer buzz;

DigitalOut greenLED(LED1);
DigitalOut blueLED(LED2);
DigitalOut redLED(LED3);


int main()
 {     while(true)
 {

    greenLED = 1; 
    blueLED = 0;
    redLED = 0;
    if( greenLED == 1 )
 {
 buzz.playTone("C");
 }
 else {
 NULL;
 }
 if( blueLED == 1 )
 {
 buzz.playTone("D");
 }
 else {
 NULL;
 }
 if( redLED == 1 )
 {
 buzz.playTone("G");
 }
 else {
 NULL;
 }
    wait_us(2500000); 

    greenLED = 0;
    blueLED = 1;
    redLED = 0;
    if( greenLED == 1 )
{
 buzz.playTone("C");
 }
 else {
 NULL;
 }
 if( blueLED == 1 )
 {
 buzz.playTone("D");
 }
 else {
 NULL;
 }
 if( redLED == 1 )
 {
 buzz.playTone("G");
 }
 else {
 NULL;
 }
    wait_us(2500000); 

    greenLED = 0;
    blueLED = 0;
    redLED = 1;
    if( greenLED == 1 )
 {
 buzz.playTone("C");
 }
 else {
 NULL;
 }
 if( blueLED == 1 )
 {
 buzz.playTone("D");
 }
 else {
 NULL;
 }
 if( redLED == 1 )
 {
 buzz.playTone("G");
 }
 else {
 NULL;
 }
    wait_us(2500000); 

    greenLED = 0;
    blueLED = 0;
    redLED = 0;
    if( greenLED == 1 )
 {
 buzz.playTone("C");
 }
 else {
 NULL;
 }
 if( blueLED == 1 )
 {
 buzz.playTone("D");
 }
 else {
 NULL;
 }
 if( redLED == 1 )
 {
 buzz.playTone("G");
 }
 else {
 NULL;
 }
  }
   }

Answer 1

你总是可以在 main 函数之前创建一个像这样的 void 函数，这样你就可以调用它，运行里面有什么，然后 return 回到 main 函数。

void play(){
    if( greenLED == 1 ){
     buzz.playTone("C");
    }
    if( blueLED == 1 ){
     buzz.playTone("D");
    }
    if( redLED == 1 ){
     buzz.playTone("G");
    }
 }

所以你将像这样实现它，每次你想播放声音时调用该函数。

Buzzer buzz;

    DigitalOut greenLED(LED1);
    DigitalOut blueLED(LED2);
    DigitalOut redLED(LED3);

void play(){
    if( greenLED == 1 ){
     buzz.playTone("C");
    }
    if( blueLED == 1 ){
     buzz.playTone("D");
    }
    if( redLED == 1 ){
     buzz.playTone("G");
    }
 }



int main(){ 
    while(true){

    greenLED = 1; 
    blueLED = 0;
    redLED = 0;

    play();

    wait_us(2500000);

    greenLED = 0; 
    blueLED = 1;
    redLED = 0;

    play();

    wait_us(2500000);

然后迭代打开和关闭 LED 等。

如何不重复 if 语句并允许它以某种方式查找它们？我很新，我确定这是基本的

How to not repeat the if statements and allow it to look them up somehow? I am very new, im sure this is basic

c

c++

mbed