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2， 判断100以内的素数

package com.my.gududu;import java.util.*;public class dadada{public static void main(String[] args) {int j;for (int i = 2; i < 100; i++) {for (j = 2; j < i; j++) {if (i % j == 0) {break;}}if (j >= i / 2 + 1) {System.out.print(i + " ");}}}
}

package com.my.gududu;import java.util.*;public class dadada{public static void main(String[] args) {int i, j;boolean flag;for (i = 2; i <= 100; i++) {flag = true;for (j = 2; j < i; j++) {if (i % j == 0) {flag = false;}}if (flag) {System.out.print(i + " ");}}}
}

3.水仙花数

package com.my.gududu;import java.util.*;public class dadada{public static void main(String[] args) {int a, b, c;for (int  i = 100; i <= 999; i++) {a = i / 100;b = (i / 10) % 10;c = i % 10;if (Math.pow(a, 3) + Math.pow(b, 3) + Math.pow(c, 3) == i) {System.out.println(i + " ");}}}
}

4.编写程序计算 1-1/2+1/3-1/4.....前10项，小数点后面撆留2位，将下列程序补充完整并运潎，撆存为：e306.java

package com.my.gududu;import java.util.*;public class dadada{public static void main(String[] args) {int i = 1;double sum = 0, t = 1.0, f = 1;while (i <= 10) {sum += t;i++;f = -f;t = f * (1.0 / i);System.out.println(t);}System.out.printf("%.2f", sum);}
}

5.编写撊序在键撉中输撋一个整撀，撍撎其撌否素撀。

package com.my.gududu;import java.util.*;public class dadada{public static void main(String[] args) {int n;Scanner input = new Scanner(System.in);n = input.nextInt();boolean f = true;for (int i = 3; i < Math.sqrt(n) + 1; i++) {if (n % i == 0) {f = false;System.out.println("false");break;}}if (f) {System.out.println("true");}}
}

6.

在键撉撂入一系列双精度数，潵撖撂入0时，停止撂入。求这一撐列数据之和并撂撔，要求小数撏后面保留2位

package com.my.gududu;import java.util.*;public class dadada{public static void main(String[] args) {double n;Scanner input = new Scanner(System.in);double sum = 0.0;do {n = input.nextDouble();sum += n;} while (n != 0);System.out.println(sum);}
}

7.冒泡排序

package com.my.gududu;import java.util.*;public class dadada{public static void main(String[] args) {int arr[] = new int[10];Scanner input = new Scanner(System.in);for (int i = 0; i < 10; i++) {arr[i] = input.nextInt();}for (int i = 0; i < 9; i++) {for (int j = 0; j < 8 - i; j++) {if (arr[j] >= arr[j + 1]) {int tmp = arr[j];arr[j] = arr[j + 1];arr[j + 1] = tmp;}}}for (int i = 0; i < 10; i++) {System.out.printf("%d ", arr[i]);}}
}