我想在 java 中显示乘法 table 但只显示 1 到 20

Question

我当前的 java 程序显示从零到无穷大的乘法 table。

我只想限制从 1 到 20...我只想乘法 table 输出从 0 到 20。
即我不希望零或任何大于 20 的数字的乘法 table 作为输出。
是否可以仅使用循环来完成我想做的事情
如果不循环那么如何
我从 hackerrank 复制了这个问题和解决方案... 这是代码...

import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.regex.*;
public class Solution {
  public static void main(String[] args) throws IOException {
    BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
    int N = Integer.parseInt(bufferedReader.readLine().trim());
    for (int i = 0; i < 10; i) {
      System.out.println(N " x "(i 1)
        " = "(N * (i 1)));
    }
    bufferedReader.close();
  }
}```

Answer 1

for (int i=1; i <= 10; i++){
    int result = N*i;
    if (result >= 1 && result <= 20) {
        System.out.println(N + " x " + i + " = " + result);
    }
}

似乎是要走的路...我是不是在某种程度上误解了这个问题？这看起来相当简单...

Answer 2

你的大部分代码都很好，你只需要添加一个条件来验证 1 到 20 的数字，你还需要从 1 而不是 0 开始循环，看看下面的代码，这将解决你的问题

public static void main(String[] args) throws IOException {

    BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));

    int N = Integer.parseInt(bufferedReader.readLine().trim());
    if (N >= 1 && N <= 20) {
        for (int i = 1; i < 10; i++) {
            System.out.println(N + " x " + (i + 1) + " = " + (N * (i + 1)));
        }
    } else {
        System.out.println("Enter Numbers in between 1 to 20");
    }

    bufferedReader.close();

}

Answer 3

在for循环之前使用if语句

 if(N >0 && N<=20){
   for (int i=1; i<= 10; i++){

       System.out.println(N + " x " + (i) + " = " + (N *i));
   }
} else{  
    // Number should be greater than 0 and less than 21
 }

Answer 4


import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class Solution {

   public static void main(String[] args) throws IOException {

      try(BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in))){
          //Let say we are getting the limit of the table number from console
          int endTableNumber = Integer.parseInt(bufferedReader.readLine().trim());
          
          //As per condition table number neither above 20 nor zero 
          if(endTableNumber <=0 || endTableNumber > 20) {
              System.err.println("Allowed Table printing limit is 1 to 20");
          }
          
          //setting offset table number as 1 as per condition
          int startTableNumber = 1;
       
          //outer for loop: table
          for (int i=startTableNumber; i<= endTableNumber; i++){
              System.out.println("Table : "+ i);
            //outer for loop: table's entry
              for(int j=1; j <= 20; j++ ) {
                  System.out.println(j + " x " + (i) + " = " + (j * (i)));
              }
              System.out.println("");
          }
      }

  }

}

我想在 java 中显示乘法 table 但只显示 1 到 20

I want to display multiplication table in java but only from 1 to 20

java

multiplication