模拟计算器逻辑
无界面，仅简单加减乘除逻辑运算。
package com.wt.www;
import java.util.Scanner;
public class Count {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
double i = scanner.nextDouble(); //获取第一个数字
char com = scanner.next().charAt(0); //获取运算符
double t = scanner.nextDouble(); //获取第二个数字
while ( com != '=') { //如果运算符不为等号，则一直运算。
i = com(i,t,com);
com = scanner.next().charAt(0);
if(com == '='){ //如果输入等号，则跳出程序，并输出最终结果。
System.out.println("程序结束，最终结果是："+i);
break;
}
t = scanner.nextDouble();
}
scanner.close();
}
public static double multiply(double i,double t){ //乘法运算
double sum;
return sum = i * t;
}
public static double divide(double i,double t){ //除法运算
double sum;
return sum = i / t;
}
public static double add(double i,double t){ //加法运算
double sum;
return sum = i + t;
}
public static double minus(double i,double t){ //减法运算
double sum;
return sum = i - t;
}
public static double com(double i,double t ,char com){ //运算符判断，并运算
double sum = 0;