Java入门——day31

1.编写程序，完成用户信息录入。要求录入姓名，性别，年龄，家庭住址这四项信息。

import java.util.Scanner;
public class Person {
    String name;
    String sex;
    int age;
    String home;

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.print("请输入用户人数：");
        int n = in.nextInt();
        Person per[] = new Person[n];
        for (int i = 0; i < per.length; i++) {
            per[i] = new Person();
            System.out.println("请输入第" + (i + 1) + "个用户信息");
            System.out.print("姓名：");
            per[i].name = in.next();
            System.out.print("性别：");
            per[i].sex = in.next();
            System.out.print("年龄：");
            per[i].age = in.nextInt();
            System.out.print("家庭住址：");
            per[i].home = in.next();
        }
        System.out.println();
        System.out.println("输出用户信息：");
        for (int i = 0; i < per.length; i++) {
            System.out.printf("%-10s", per[i].name);
            System.out.print("\t" + per[i].sex + "\t" + per[i].age + "\t");
            System.out.printf("%-10s\n", per[i].home);
        }
    }
}

 

 

 

 

 

 

 2.编写求两个数之和的函数，要求使用函数重载，能求整数、长整型、浮点、双精度等数的和。

package helloworld;
import java.util.Scanner;
public class study{
    public static int sum(int a,int b) {
        return a+b;
    }
    public static long sum(long a,long b)
    {
     return a+b;
    }
    public static float sum(float a,float b)
    {
     return a+b;
    }
    public static double sum(double a,double b)
    {
     return a+b;
    }
    public static void main(String[] args){
        Scanner in=new Scanner(System.in);
        System.out.println("请输入两个int型数：");
        int a1,a2;
        a1=in.nextInt();
        a2=in.nextInt();
        System.out.println("两数之和："+sum(a1,a2));
        System.out.println("请输入两个long型数：");
        long b1,b2;
        b1=in.nextLong();
        b2=in.nextLong();
        System.out.println("两数之和："+sum(b1,b2));
        System.out.println("请输入两个float型数：");
        float c1,c2;
        c1=in.nextFloat();
        c2=in.nextFloat();
        System.out.println("两数之和："+sum(c1,c2));
        System.out.println("请输入两个double型数：");
        double d1,d2;
        d1=in.nextDouble();
        d2=in.nextDouble();
        System.out.println("两数之和："+sum(d1,d2));
    }
}