5数组
- 5.1数组
- 5.1.1初识数组
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1 // 输出大于平均数的所有数 2 Scanner in = new Scanner(System.in); 3 int n; 4 int[] a = new int[100]; 5 int count = 0; 6 double sum = 0; 7 while ((n = in.nextInt()) != -1) 8 { 9 a[count] = n; 10 sum += n; 11 count++; 12 } 13 if (count > 0) 14 { 15 16 for (int i = 0; i < count; i++) 17 { 18 if (a[i] > (sum / count)) 19 { 20 System.out.println(a[i]); 21 } 22 } 23 System.out.println("平均数为:" + sum / count); 24 }
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- 5.1.2创建数组
- 5.1.3数组的元素
- 数组的大小不能改变
- 5.1.4数组变量
- 普通变量所有者
- 数组变量管理者
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1 int[] a = new int[10]; 2 a[0] = 5; 3 int[] b = a; 4 System.out.println(a[0]); 5 System.out.println(b[0]); 6 for (int i = 0; i < b.length; i++) 7 { 8 if (i == b.length - 1) 9 { 10 System.out.println(b[i]); 11 break; 12 } 13 System.out.print(b[i]); 14 } 15 System.out.println(a); 16 System.out.println(b);
- 5.1.1初识数组
- 5.2数组计算
- 5.2.1投票统计
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1 // 投票统计 2 Scanner in = new Scanner(System.in); 3 int x; 4 int[] numbers = new int[10]; 5 while ((x = in.nextInt()) != -1) 6 { 7 if ((x >= 0) && (x <= 9)) 8 { 9 numbers[x]++; 10 } 11 } 12 for (int i = 0; i < numbers.length; i++) 13 { 14 System.out.println(i + ": " + numbers[i]); 15 }
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- 5.2.2遍历数组
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1 // 遍历数组 2 Scanner in = new Scanner(System.in); 3 int x = in.nextInt(); 4 int[] a = 5 { 3, 4, 5, 6, 7, 8, 32, 45 }; 6 int loc = -1; 7 boolean flag = false; 8 for (int i = 0; i < a.length; i++) 9 { 10 if (x == a[i]) 11 { 12 loc = i; 13 break; 14 } 15 } 16 for (int k : a) 17 { 18 if (k == x) 19 { 20 flag = true; 21 } 22 } 23 if (flag) 24 { 25 System.out.println(x + "存在"); 26 System.out.println(x + "在第" + (loc + 1) + "个"); 27 } else 28 { 29 System.out.println(x + "不在其中"); 30 }
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- 5.2.3素数
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1 // 素数 2 Scanner in = new Scanner(System.in); 3 System.out.println("请输入一个数:"); 4 int x = in.nextInt(); 5 boolean isPrime = true; 6 if (x == 1 || x % 2 == 0 && x != 2) 7 { 8 isPrime = false; 9 } else 10 { 11 for (int i = 3; i < Math.sqrt(x); i+=2) 12 { 13 if (x%i==0) 14 { 15 isPrime=false; 16 break; 17 } 18 } 19 } 20 if (isPrime) 21 { 22 System.out.println(x+"是素数"); 23 }else 24 { 25 System.out.println(x+"不是素数"); 26 }
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- 5.2.1投票统计
- 5.3二维数组
- OX棋
原文地址:https://www.cnblogs.com/quxiangjia/p/12003945.html
时间: 2024-10-11 20:18:29