Java小程序之两数计算器
条评论这个案例是我练习方法的使用时做的，应该能有更好的方式实现这个功能。
代码如下
package cn.yingyu5658.basic;
import org.w3c.dom.ls.LSOutput;
import java.util.Scanner;
public class Basic {
public static void main(String[] args) {
for (; ; ) {
System.out.println("欢迎使用！");
System.out.println("按键1 2 3 4分别为加 减 乘 除，输入后请回车");
Scanner startSc = new Scanner(System.in);
int selectNumber = startSc.nextInt();
if(selectNumber >4) {
System.out.println("请输入正确的数字以选择！");
}
//以下为加法
if (selectNumber == 1) {
System.out.println("请输入您要计算的第一个数字");
Scanner jiafaSc = new Scanner(System.in);
int jiafa1 = jiafaSc.nextInt();
System.out.println("请输入您要计算的第二个数字");
int jiafa2 = jiafaSc.nextInt();
jiafa(jiafa1, jiafa2);
}
//以下为减法
if (selectNumber == 2) {
System.out.println("请输入您要计算的第一个数字");
Scanner jianfaSc = new Scanner(System.in);
int jianfa1 = jianfaSc.nextInt();
System.out.println("请输入您要计算的第二个数字");
int jianfa2 = jianfaSc.nextInt();
jianfa(jianfa1, jianfa2);
}
//以下为乘法
if (selectNumber == 3) {
System.out.println("请输入您要计算的第一个数字");
Scanner chengfaSc = new Scanner(System.in);
int chengfa1 = chengfaSc.nextInt();
System.out.println("请输入您要计算的第二个数字");
int chengfa2 = chengfaSc.nextInt();
chengfa(chengfa1, chengfa2);
}
if (selectNumber == 4) {
System.out.println("请输入您要计算的第一个数字");
Scanner chufaSc = new Scanner(System.in);
int chufa1 = chufaSc.nextInt();
System.out.println("请输入您要计算的第二个数字");
int chufa2 = chufaSc.nextInt();
chufa(chufa1, chufa2);
}
System.out.println("-----------------------------------------");
}
}
//加减乘除各项功能的方法，上面直接调用
public static int jiafa(int a, int b) {
int jieguo = a + b;
System.out.println(jieguo);
return a + b;
}
public static int jianfa(int a, int b) {
int jieguo = a - b;
System.out.println(jieguo);
return a - b;
}
public static int chengfa(int a, int b) {
int jieguo = a * b;
System.out.println(jieguo);
return a * b;
}
public static int chufa(int a, int b) {
int jieguo = a / b;
System.out.println(jieguo);
return a / b;
}
}
