arduino计算器代码

//定义变量
int num1, num2, answer, correct, wrong;
unsigned long startTime, endTime;

void setup() {
  //初始化串口
  Serial.begin(9600);
  //初始化LED灯
  pinMode(13, OUTPUT);
  //初始化随机数种子
  randomSeed(analogRead(0));
}

void loop() {
  //欢迎界面
  Serial.println("Welcome to the calculator!");
  Serial.println("Press A to start answering questions.");

  //等待用户按下A键
  while (true) {
    if (Serial.available() > 0) {
      if (Serial.read() == 'A') {
        break;
      }
    }
  }

  //开始答题
  for (int i = 0; i < 10; i++) {
    //生成两个随机数
    num1 = random(0, 101);
    num2 = random(0, 101);

    //输出题目
    Serial.print(num1);
    Serial.print(" + ");
    Serial.print(num2);
    Serial.print(" = ");

    //等待用户输入答案
    while (true) {
      if (Serial.available() > 0) {
        answer = Serial.parseInt();
        if (Serial.read() == 'D') {
          break;
        }
      }
    }

    //判断答案是否正确
    if (answer == num1 + num2) {
      //正确
      digitalWrite(13, HIGH);
      Serial.println("Great!");
      delay(2000);
      digitalWrite(13, LOW);
      correct++;
    } else {
      //错误
      digitalWrite(13, HIGH);
      Serial.println("Losing");
      delay(2000);
      digitalWrite(13, LOW);
      wrong++;
    }
  }

  //本轮回答结束，显示结果
  Serial.print("Correct: ");
  Serial.println(correct);
  Serial.print("Wrong: ");
  Serial.println(wrong);
  Serial.print("Time: ");
  endTime = millis();
  Serial.println((endTime - startTime) / 1000);
  Serial.println("Press A to start the next round.");

  //等待用户按下A键
  while (true) {
    if (Serial.available() > 0) {
      if (Serial.read() == 'A') {
        break;
      }
    }
  }
}