1.输出九九乘法表;
package Day08; public class Test03 { public static void main(String[] args) { for (int i = 1; i <=9 ; i++) { for (int j = 1; j <=i ; j++) { System.out.print(" " + i + "*" + j + "=" + (i * j) + "\t"); if (i == j) { System.out.print("\n"); } } } } }
package Day08; import java.util.Scanner; //循环录入5个人的年龄,并计算平均年龄, // 如果录入的数据出现负数或者大于130的数,立即停止输出报错(无需打印平均年龄) public class Test06 { public static void main(String[] args) { int sum = 0; Scanner in =new Scanner(System.in); int count=0; do { for (int i = 1; i <=5 ; i++) { System.out.println("请输入第"+i+"个人的年龄"); int age =in.nextInt(); if (age<0||age>130){ System.out.println("输入有误,请输入0~130的数字年龄"); break; } ++count; sum+=age; } }while (count<=4); System.out.println("平均年龄是"+sum/count); } }