题目内容

输入20个整数,分别求出所有正数之和、所有负数之和、零的个数Scanner sc=new Scanner(System.in);int positiveSum = 0;int negativeSum = 0;int zeroCount = 0;for(int i=1; 1;i++){System.out.println("请输入整数");int num = Integer.parseInt(sc.nextLine());if ( 2)positiveSum += num;else if ( 3)negativeSum += num;else4;}System.out.println("正数和" + positiveSum + ",负数和" + negativeSum + ",零的个数" + zeroCount);

查看答案

搜索结果不匹配？点我反馈

更多问题

判断一个正整数是否为质数Scanner sc=new Scanner(System.in);boolean isPrime = true;System.out.println("请输入一个大于等于2的正整数:");int num = Integer.parseInt(sc.nextLine());for ( 1; i < num; i++){if (num % i == 0){isPrime = 2;break;}}if (isPrime)System.out.println(num + "是质数!");elseSystem.out.println(num + "不是质数!");

输出以下图形(第一行前没有空格)************** * **for(int i=1; 1;i++){for(int j=1; 2;j++){System.out.print(" ");}for(int j=1; 3; 4){System.out.print("*");}5;}

打印下面平等四边形(第一行前4个空格,第二行前2个空格,最后一行没有空格)* ********for (int i = 1; 1; 2){for (int j = 1; 3; j++){System.out.print(" ");}for (int j = 1; 4; j++){System.out.print("*");}System.out.println();}

打印200-300之间的所有素数System.out.println("200-300之间的素数有:");for (int num = 200; num <= 300; num++){boolean isPrime =1;for (int i = 2; i <= num - 1; i++){if (2){isPrime =3;break;}}if (isPrime){System.out.print(num + " ");}}