1.有10个评委打分,(去掉一个最高一个最低)求平均分。
Scanner sc = new Scanner(System.in); int arr[] = new int[10]; double sum = 0; int j = 1; double pj = 0; for (int i = 0; i < arr.length; i++) { System.out.println("请输入第" + (i + 1) + "个数:"); arr[i] = sc.nextInt(); } System.out.println("将数组按从小到大进行排序!!!"); for (int x = 0; x < arr.length - 1; x++) { for (int y = 0; y < arr.length - 1 - x; y++) { if (arr[y] > arr[y + 1]) { int temp = arr[y + 1]; arr[y + 1] = arr[y]; arr[y] = temp; } } } for (int n : arr) { System.out.println(n + ","); } for (; j < arr.length - 1; j++) { sum += arr[j]; pj = sum / j; } System.out.println("数组中去掉一个最高一个最低后的平均数为:" + pj);
2.自学一下Java随机数,生成一个长度为10的随机数组(每个数的范围是0~99),排序后输出。
Random r = new Random(); int arr[] = new int[10]; for (int i = 0; i < arr.length; i++) { arr[i] = r.nextInt(100); System.out.print(arr[i] + ", "); } System.out.println(); System.out.println("随机数开始排序!!!"); for (int x = 0; x < arr.length - 1; x++) { for (int y = 0; y < arr.length - 1 - x; y++) { if (arr[y] > arr[y + 1]) { int temp = arr[y + 1]; arr[y + 1] = arr[y]; arr[y] = temp; } } } for (int n : arr) { System.out.println(n + ", "); } } }
3.制作彩票35选7程序。 (就是1~35随机生成7个不重复的数)
Random r = new Random(); int arr[] = new int[7]; for (int i = 0; i < arr.length; i++) { arr[i] = r.nextInt(35) + 1; System.out.print(arr[i] + ", "); } System.out.println(); for (int i = 0; i < arr.length; i++) { for (int j = 0; j < arr.length; j++) { while (arr[i] == arr[j]) { if (i == j) { break; } arr[i] = r.nextInt(35) + 1; } } System.out.println("新生成的第" + (i + 1) + "个不重复的数为:" + arr[i]); } System.out.println(); System.out.print("1~35随机生成7个不重复的数后排序为:"); for (int x = 0; x < arr.length - 1; x++) { for (int y = 0; y < arr.length - 1 - x; y++) { if (arr[y] > arr[y + 1]) { int temp = arr[y + 1]; arr[y + 1] = arr[y]; arr[y] = temp; } } } for (int n : arr) { System.out.print(n + ", "); }
4.定义一个长度为10的int数组(如果没有特殊说明,静态赋值动态赋值都可以),统计数组中的最大值、最小值、以及奇 数和偶数的个数
Scanner sc = new Scanner(System.in); int arr[] = new int[10]; int js = 0, os = 0; for (int i = 0; i < arr.length; i++) { System.out.println("请输入第" + (i + 1) + "个数:"); arr[i] = sc.nextInt(); } int max = arr[0], min = arr[0]; for (int x = 1; x < arr.length; x++) { if (arr[x] > max) { max = arr[x]; } else if (arr[x] < min) { min = arr[x]; } } for (int y = 0; y < arr.length; y++) { if (arr[y] % 2 == 0) { os++; } else { js++; } } System.out.println("该数组中最大值为:" + max + "," + "该数组中最小值为:" + min); System.out.println("该数组中奇数个数为:" + js + "," + "该数组中偶数个数为:" + os);
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