java - 加法游戏栅栏柱问题，加法符号显示在等式之前

Question

我正在制作一个加法游戏，但我遇到的唯一问题是加法符号不断出现在问题之前，即使它前面没有数字。解决这个问题最简单的方法是什么？

  package addgame;
  import java.util.Random;
 import java.util.Scanner;
 public class AddingGame {
private static Scanner console;

public static void main (String[]args) {
System.out.println("We are going to play an adding game, you have 3 tries. Type your answer.");
equation(); 
}   
public static void equation() {
    int tries = 5;
    int points=0;
    Random rand = new Random ();
    while (tries>=3) {
    int totalnums = rand.nextInt(4)+1;
    int sumAns=0;
    for (int i=1; i<=totalnums+1;i++) {
    int nums= rand.nextInt(10)+1;
    System.out.print(" + "+nums ); 
    sumAns+=nums;
}
    System.out.print(" = ");
    console = new Scanner (System.in);
    int ans = console.nextInt();
    if(ans!=sumAns) {
        tries--;
    }
    else if(tries>=3) {
    points++;   
    }
    if(tries<3) {
            System.out.println("Game Over...");
            System.out.println("Points="+points+"\nBetter luck next time!");

        }
    }

  }
 }

Answer 1

除了您发布的内容之外，这里还有几个问题。

首先，当只有 3 次尝试时，不要使用 attempts = 5。这还不清楚。如果您或其他人稍后必须查看该计划怎么办？你知道“tries = 5”是什么意思吗？

如果你说类似的话

int triesLeft = 3;

歧义要少得多。从 3 开始，您的 while 语句也更加简单。

while (triesLeft > 0) {

同样，你想要添加多少个数字也有点不清楚。正如您所注意到的，如果您要添加的数字数量是 0 或 1，那么在加法游戏中就会出现问题。您的解决方案确实有效。但是，如果您这样做...(我也在这段代码中包含了您的问题的一种可能的解决方案。)

int numberOfAddends = rand.nextInt(4)+2;  //This assumes the maximum number of numbers you want to add is 5 (i.e. 3 + 2), and the minimum number is 2.
int sumAns = rand.nextInt(10)+1;  //Now note these two lines.
System.out.print(sumAns); //this will make sure the first number is printed before the + sign

for (int i=1; i < numberOfAddends;i++) { 
    //the inside of this for loop can stay the same.
}

请注意，现在更容易判断发生了什么。是否有任何方法可以使其更加清晰，可能值得考虑。

过了这一点，您的代码实际上只是一些小事情。

while(triesLeft > 0) {
    .
    .
    .
    if(ans!=sumAns) {
        tries--;
    }
    else {  //the check you specified was only ever reachable when the condition you were checking is true. What you wrote was equivalent to else if (true). 
    points++;   
    }
}
System.out.println("Game Over..."); //You don't need a check for this when it is placed outside the while loop. 
System.out.println("Points="+points+"\nBetter luck next time!");