如何在彩票程序中對數組進行線性搜索

Question

我在這裏有一個程序，這真的讓我很困惑（主要是因爲我嘗試了不同的方法來使它工作，並且遇到了某種錯誤每次）。我應該創建一個程序，通過隨機生成6個數字並讓用戶輸入6個自己選擇的數字來模擬真實生活中的彩票。現在該程序應該對這兩個數組進行線性搜索，並查看用戶的任何數字是否等於隨機生成的數字，但我被教導使用線性搜索的方式不包括一次搜索多個數字（即使用數組），我因此困惑如何返回一個整數，如果大於零，打印「你贏了」的聲明，如果小於零打印，「你已經失去了聲明」。

import java.util.*; 
import java.text.*; 

public class Lotto649 { 

public static void main(String[] args) { 
    Scanner s = new Scanner (System.in); 


    int [] playernums = new int [6]; 
    int [] usernums = new int [6]; 
    int [] result = new int [6]; 
    int verdict; 
    int index; 

    System.out.printf ("Play Lotto 649 %n%n"); 

    // Get randomly generated numbers from method and add them to array 'result' 
    result = GenerateLotto (playernums); 


    // get 6 numbers from user 
    for (int j = 0; j < usernums.length; j++){ 
     System.out.printf ("Please enter a number between 1 and 49: "); 
     usernums[j] = s.nextInt(); 
    } 

    // Print the winning numbers that were randomly generated 
    for (int i = 0; i < result.length; i++){ 
    System.out.printf ("The winning Lotto 649 numbers are: " + result[i] + ", "); 
    } 

} 

// Method to fill array with winning lottery numbers 
public static int [] GenerateLotto (int [] a){ 
    Random g = new Random(); 

    // fill array with 6 randomly generated numbers 
    for (int i = 0; i < a.length; i++){ 
      a[i] = g.nextInt (49) + 1; 
    } 

    return a; 
} 

index = find (playernums,results); 


// int [] A is player nums (player chosen numbers) 
// int [] B is results array (RNG numbers) 
public static int find (int[] A, int[] B){ 

    for (int index = 0; index < A.length; index++){ 
     for (int index2 = 0; index2 < B.length; index2++){ 
      if (A[index] == B[index2]) 
         return index; 
    } 
    } 
} 
} 

我已經停止了現在的代碼搞亂了，因爲我覺得我會進一步打破它。

Answer 1

這個解決方案工作得很好：

import java.util.*; 
import java.text.*; 

public class Lotto649 { 

    public static void main(String[] args) { 
     Scanner s = new Scanner (System.in); 

     int[] playernums = new int[6]; 
     int [] usernums = new int [6]; 
     int [] result = new int [6]; 
     int input; 
     int verdict; 

     System.out.printf ("Play Lotto 649 %n%n"); 

     // Get randomly generated numbers from method and add them to array 'result' 
     result = GenerateLotto (playernums); 


     // get 6 numbers from user 
     for (int j = 0; j < usernums.length; j++){ 
      System.out.printf ("Please enter a number between 1 and 49: "); 
      input = Integer.parseInt(s.nextLine()); 

      if (input < 1 || input > 49) { // Check if input is less than 1 or 49 
       System.out.println("Sorry, you must enter a number between 1 and 49."); 
       j--;      // Decrement j so it asks for the number again (without decrementing there wouldn't be 6 total numbwrs). 
      } else { 
       usernums[j] = input;  // Store user input into usernums 
      } 
     } 

     // Print the winning numbers that were randomly generated 
     System.out.printf ("The winning Lotto 649 numbers are: "); 
     for (int i = 0; i < result.length; i++) { 
      if (i < result.length - 1) 
       System.out.print(result[i] + ", "); 
      else 
       System.out.print(result[i]); 
     } 

     verdict = find(result, usernums); 

     if (verdict == 0) { 
      System.out.println("\nYou had no winning numbers. Thanks for wasting your money and making us rich!"); 
     } else { 
      System.out.println("\nYou had " + verdict + " matches. Looks like we need to cough up the prize money."); 
     } 

    } 

    // Method to fill array with winning lottery numbers 
    public static int [] GenerateLotto (int [] a){ 
     Random g = new Random(); 

     // fill array with 6 randomly generated numbers 
     for (int i = 0; i < a.length; i++){ 
      a[i] = g.nextInt (49) + 1; 
     } 

     return a; 
    } 

    // index = find (playernums,results); 


    // int [] A is player nums (player chosen numbers) 
    // int [] B is results array (RNG numbers) 
    public static int find (int[] A, int[] B) { 
     int matches = 0; 
     for (int index = 0; index < A.length; index++){ 
      for (int index2 = 0; index2 < B.length; index2++) { 
       if (A[index] == B[index2]) 
        matches++; 
      } 
     } 
     return matches; 
    } 
} 

，如果你喜歡的解決方案，請給我一個很好的評價。

Answer 2

你有一些編譯時錯誤，你可以請嘗試下面的代碼，謝謝

import java.util.*; 


public class Lotto649 { 

public static void main(String[] args) { 
    Scanner s = new Scanner (System.in); 


    int [] playernums = new int [6]; 
    int [] usernums = new int [6]; 
    int [] result = new int [6]; 
    int verdict; 
    int index; 

    System.out.printf ("Play Lotto 649 %n%n"); 

    // Get randomly generated numbers from method and add them to array 'result' 
    result = GenerateLotto(playernums); 


    // get 6 numbers from user 
    for (int j = 0; j < usernums.length; j++){ 
     System.out.printf ("Please enter a number between 1 and 49: "); 
     usernums[j] = s.nextInt(); 
    } 

    // Print the winning numbers that were randomly generated 
    for (int i = 0; i < result.length; i++){ 
    System.out.printf ("The winning Lotto 649 numbers are: " + result[i] + ", "); 
    } 

    int wonOrLost = find (usernums,result); 
    if(wonOrLost > 0) 
     System.out.println("You've won"); 
    else 
     System.out.println("You've lost statement"); 

} 

// Method to fill array with winning lottery numbers 
public static int [] GenerateLotto (int [] a){ 
    Random g = new Random(); 

    // fill array with 6 randomly generated numbers 
    for (int i = 0; i < a.length; i++){ 
      a[i] = g.nextInt (49) + 1; 
    } 

    return a; 
} 




// int [] A is player nums (player chosen numbers) 
// int [] B is results array (RNG numbers) 
public static int find (int[] A, int[] B){ 

    for (int index = 0; index < A.length; index++){ 
     for (int index2 = 0; index2 < B.length; index2++){ 
      if (A[index] == B[index2]) 
         return 1; 
    } 
    } 
    return -1; 
} 
}