Question

我正在创建一个生成随机数的程序，您猜不到，然后告诉您是否正确。代码是：

void guessNumber();
  {
    //Asks for guess of the number. Prints whether the guess is above or below randomNumber.
    Scanner reader = new Scanner(System.in);
    numberOfTries = 0;
    While(userGuess != randomNumber);
       System.out.println("Guess the number ");
       int userGuess = reader.nextLine();
       If (userGuess = randomNumber); {
          numberOfTries += 1;
         System.out.println("Correct! It took you " + numberOfTries + " tries to find my numnber");
       } Else; {
         distanceFromNumber = Math.abs(7);
         numberOfTries += 1;
         System.out.println("Incorrect! The number that you guessed is " + distanceFromNumber + "numbers away from my number ");
       }
  }

编译器返回“Else”部分不是语句。如果我从“If”和“Else”行中删除分号，编译器还会告诉我这两行是期望';'。我也尝试改变括号的格式，这没有帮助。

Answer 1

否则应该是小写，就像Java中的所有关键字一样，不应该以分号结尾

...
} else {
...

在if（）或while（）语句之后也不应该有一个分号，而你的while（）语句后面没有开括号，即

while(true)
{ //missing
}

总之，另外

void guessNumber() //EDIT removed semi-colon
  {
    //Asks for guess of the number. Prints whether the guess is above or below randomNumber.
    Scanner reader = new Scanner(System.in);
    numberOfTries = 0;
    while(userGuess != randomNumber) //EDIT removed semi-colon + lowercase while
    {//EDIT added this bracket
       System.out.println("Guess the number ");
       int userGuess = reader.nextLine();
       if (userGuess == randomNumber) {//EDIT removed semi colon, lowered case of 'If' & added double equals (equality testing and not assignment)
          numberOfTries += 1;
         System.out.println("Correct! It took you " + numberOfTries + " tries to find my numnber");
       } else { //EDIT removed semi-colon & changed case
         distanceFromNumber = Math.abs(7);
         numberOfTries += 1;
         System.out.println("Incorrect! The number that you guessed is " + distanceFromNumber + "numbers away from my number ");
       }
    }//EDIT Added this bracket
  }

Answer 2

你正在使用大写字母，特殊字总是在小写

void guessNumber()
  {
    //Asks for guess of the number. Prints whether the guess is above or below randomNumber.
    Scanner reader = new Scanner(System.in);
    numberOfTries = 0;
    while(userGuess != randomNumber);
       System.out.println("Guess the number ");
       int userGuess = reader.nextLine();
       if (userGuess = randomNumber) {
          numberOfTries += 1;
         System.out.println("Correct! It took you " + numberOfTries + " tries to find my numnber");
       } else {
         distanceFromNumber = Math.abs(7);
         numberOfTries += 1;
         System.out.println("Incorrect! The number that you guessed is " + distanceFromNumber + "numbers away from my number ");
       }
  }

Answer 3

java中的关键字是低级的（while，if，else ...）

您还希望在;，while和if行之后删除else。

为了比较值，请使用：

if (userGuess == randomNumber) {

Answer 4

  If (userGuess = randomNumber)

应该是

  If (userGuess == randomNumber)

Answer 5

所有java关键字都应该是小写的，所以;

if
else
while

另外你使用==来提问是等于其他东西的问题，而不是= 设置等于其他东西。

所以

while(condition){
    if (a==b){

    }else{

    }
}

错误不是If-else语句中的语句

5 个答案: