如何从数组中获取仅输入的值？

huangapple
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英文:

how can I get the only entered values from an array?

问题

  1. import java.util.Scanner;
  3. class MultiplicationTable {
  4.     public static void main(String[] args) {
  5.         Scanner obj = new Scanner(System.in);
  6.         int arrSize = 32; // Maximum size for the array
  7.         int arr[] = new int[arrSize];
  8.         
  9.         System.out.println("How many multiplication tables do you want to print?");
  10.         int n = obj.nextInt();
  11.         
  12.         for (int i = 0; i < n; i++) {
  13.             System.out.println("Enter the number whose table you want:");
  14.             arr[i] = obj.nextInt();
  15.         }
  16.         
  17.         System.out.println("Enter the range of the multiplier:");
  18.         int range = obj.nextInt();
  19.         
  20.         for (int i = 0; i < n; i++) {
  21.             for (int j = 1; j <= range; j++) {
  22.                 System.out.println(arr[i] + "x" + j + " = " + (arr[i] * j));
  23.             }
  24.             System.out.println(); // Empty line after each table
  25.         }
  26.     }
  27. }

Output:

  1. How many multiplication tables do you want to print?
  2. 3
  3. Enter the number whose table you want:
  4. 2
  5. Enter the number whose table you want:
  6. 5
  7. Enter the number whose table you want:
  8. 6
  9. Enter the range of the multiplier:
  10. 4
  11. 2x1 = 2
  12. 2x2 = 4
  13. 2x3 = 6
  14. 2x4 = 8
  16. 5x1 = 5
  17. 5x2 = 10
  18. 5x3 = 15
  19. 5x4 = 20
  21. 6x1 = 6
  22. 6x2 = 12
  23. 6x3 = 18
  24. 6x4 = 24

Please note that I've made modifications to your code to achieve the desired output. Let me know if you need any further assistance!

英文:

I am trying to make a program to print a multiplication table in which the user enters the number of table he wants (for example 3) , also enters the values of table he wants( 2,6,5 (random/unordered)), also enters the range of multiplier.
my code is printing all the elements present in the array.
please help me. ThankYou.

  1. import java.util.Scanner;

class Addition
{
public static void main(String[] args) {

  1. 	int j=0,k=0;
  2. 	Scanner obj=new Scanner(System.in);
  3. 	int arr[]=new int[32];
  4. 	System.out.println(&quot;how many multiplication table do you want to print ? &quot;);
  5. 	int n=obj.nextInt();
  6. 	for(int i=1;i&lt;=n;i++)
  7. 	{
  8. 		System.out.println(&quot;Enter number whos table you want &quot;);
  9. 		for(j=1;j&lt;=n;j++)
  10. 		{
  11. 			arr[j]=obj.nextInt(); break;
  12. 		}
  13. 	}
  14. 	System.out.println(&quot;Enter range of multiplier&quot;);
  15. 	int range=obj.nextInt();
  16. 	
  17. 	for(int l=0;l&lt;=arr[j];l++)
  18. 	{
  19. 		for(k=1;k&lt;=range;k++)
  20. 		{
  21. 			System.out.println(&quot; &quot;+l+&quot; * &quot;+k+&quot; = &quot;+l*k);
  22. 			
  23. 		}
  24. 	}
  25. }

}

>the output I want will look somewhat like this(
how many multiplication table do you want to print ? =3 and on entering numbers 2,5,6 and range=4)

  1. 2x1=2 
  2. 2x2=4  
  3. 2x3=6   
  4. 2x4=8
  5.    
  6. 5x1=5  
  7. 5x2=10  
  8. 5x3=15  
  9. 5x4=20
  11. 6x1=6  
  12. 6x2=12  
  13. 6x3=18  
  14. 6x4=24
  18. </details>
  21. # 答案1
  22. **得分**: 0
  24. 我对您试图完成的内容进行了一些调整。您可以使用下面的代码片段：
  26. ```java
  27. import java.util.ArrayList;
  28. import java.util.Scanner;
  30. class Addition {
  31.     public static void main(String[] args) {
  32.         
  33.         Scanner obj = new Scanner(System.in);
  34.         
  35.         ArrayList<Integer> typeMultiplicationTable = new ArrayList<Integer>();
  36.         
  37.         System.out.println("要生成多少个乘法表？");
  38.         int n = obj.nextInt();
  39.         
  40.         for (int i = 1; i <= n; i++) {
  41.             System.out.println("请输入您想要的乘法表的数字：");
  42.             typeMultiplicationTable.add(obj.nextInt());
  43.         }
  44.         
  45.         System.out.println("请输入范围：");
  46.         int range = obj.nextInt();
  47.         
  48.         for (int l = 0; l < typeMultiplicationTable.size(); l++) {
  49.             for (int k = 0; k <= range; k++) {
  50.                 System.out.println(typeMultiplicationTable.get(l) + " * " + k + " = " + typeMultiplicationTable.get(l) * k);
  51.             }
  52.         }
  53.     }
  54. }

如果您最终决定使用数组，您可以按照以下方式实现，我删除了一个for循环：

  1. import java.util.Scanner;
  3. class Addition {
  4.     public static void main(String[] args) {
  5.         
  6.         Scanner obj = new Scanner(System.in);
  7.         
  8.         System.out.println("要生成多少个乘法表？");
  9.         int n = obj.nextInt();
  10.         
  11.         int arr[] = new int[n]; 
  13.         for (int j = 0; j < arr.length; j++) {
  14.             System.out.println("请输入您想要的乘法表的数字：");
  15.             arr[j] = obj.nextInt();
  16.         }
  17.         
  18.         System.out.println("请输入范围：");
  19.         int range = obj.nextInt();
  20.         
  21.         for (int l = 0; l < arr.length; l++) {
  22.             for (int k = 0; k <= range; k++) {
  23.                 System.out.println(arr[l] + " * " + k + " = " + arr[l] * k);
  24.             }
  25.         }
  26.     }
  27. }
英文:

I made a few adjustments to carry out what i think you trying to accomplish. you could use an arraylist seen below:

  1. class Addition{
  2. public static void main(String[] args) {
  3.     
  4.     int j=0,k=0;
  5.     Scanner obj=new Scanner(System.in);
  6.     
  7.     ArrayList&lt;Integer&gt; typeMultiplicationTable = new ArrayList&lt;Integer&gt;();
  8.     
  9.     //used Arraylist instead of an array
  10.     //int arr[]=new int[32]; 
  11.     System.out.println(&quot;how many table? &quot;);
  12.     int n=obj.nextInt();
  13.     
  14.     for(int i=1;i&lt;=n;i++)
  15.     {
  16.         System.out.println(&quot;Enter number whos table you want &quot;);
  17.         for(j=0;j&lt;=n;j++)
  18.         {
  19.             typeMultiplicationTable.add(obj.nextInt());
  20.             break;
  21.             //arr[j]=obj.nextInt(); break;
  22.         }
  23.     }
  24.     System.out.println(&quot;Enter range&quot;);
  25.     int range=obj.nextInt();
  26.     
  27.     for(int l=0;l&lt;=typeMultiplicationTable.size()-1;l++)
  28.     {
  29.         for(k=0;k&lt;=range;k++)
  30.         {
  31.             System.out.println(&quot; &quot;+typeMultiplicationTable.get(l)+&quot; * &quot;+k+&quot; = &quot;+typeMultiplicationTable.get(l)*k);
  32.         }
  33.     }
  34. }}

and if you do end up using an array, you could achieve it as follows - i ended up removing one of the for loops.

  1. class Addition{
  2. public static void main(String[] args) {
  3.     
  4.     Scanner obj=new Scanner(System.in);
  5.     
  6.     System.out.println(&quot;how many table? &quot;);
  7.     int n=obj.nextInt();
  8.     
  9.     int arr[]=new int[n]; 
  11.         for(int j=0;j&lt;=arr.length-1;j++)
  12.         {
  13.             System.out.println(&quot;Enter number whos table you want &quot;);
  14.             arr[j]=obj.nextInt();
  15.         }
  16.     
  17.     System.out.println(&quot;Enter range&quot;);
  18.     int range=obj.nextInt();
  19.     
  20.     for(int l=0;l&lt;=arr.length-1;l++)
  21.     {
  22.         for(int k=0;k&lt;=range;k++)
  23.         {
  24.             System.out.println(&quot; &quot;+arr[l]+&quot; * &quot;+k+&quot; = &quot;+arr[l]*k);
  25.         }
  26.     }
  27. }}

huangapple
  • 本文由 发表于 2020年9月6日 23:58:16
  • 转载请务必保留本文链接：https://go.coder-hub.com/63766118.html
  • arrays
  • for-loop
  • java
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