4回答

• 

  大猫喔

  2020-07-07 20:39:46

  Scanner sc = new Scanner(System.in);

  int num = sc.nextInt();

  int cot = 0;

  if(num%2==0) {

  for(int i=1;i<=num-1;i=i+2) {  //i每次循环加2，直到i等于num-1，停止

  cot = cot + i;

  }

  System.out.println("n为偶数，从1加到n-1之和为:" + cot);

      }else {

      for(int i=1;i<=num;i=i+2) {

      cot = cot +i;

      }

      System.out.println("n为奇数，从1加到n-1之和为:" + cot);

  }

  
  

  0 0
• 

  一纸三言两语

  2020-06-18 08:09:56

  上面n为偶数时，条件应该为i<=n-1；等于号忘写了

  0 0
• 

  一纸三言两语

  2020-06-18 07:34:37

  public class Test_if_else {

  
  

  public static void main(String[] args) {

  // TODO Auto-generated method stub

  //打印1+3+5+...+n，当n为奇数，则累加到n，若为偶数，则累加到n-1，变量n的初始值在程序中指定

  Scanner sc = new Scanner(System.in);

  System.out.println("请输入数字：");

  int n = sc.nextInt();

  int sum=0;

  if(n%2==0) {

  for(int i=1;i<n-1;) {

  sum+=i;

  i+=2;

  }

  System.out.print(sum);

  }else {

  for(int i=1;i<=n;) {

  sum+=i;

  i+=2;

  }

  System.out.println(sum);

  }

  }

  
  

  }

  
  

  0 0
• 

  qq_慕移动2467453

  2020-05-26 15:20:28

  package com.imooc;

  
  

  public class helloword {

   public static  void main (String[] args) {

  
  

  int sum = 0;

  
  

  for (int i = 1;i<=100;i++)

  {

  
  

  if ( i%2 ==0   ) {

  continue;

  }

  sum = sum + i;

  }

  System.out.println("100以内基数和为"+sum);

  }

  }

  
  

       

  
  

  0 0