java数字运算

//参考下我刚写的这个,稍显得智能一些!你可以稍加更改;思路都注释的很详细了!
//代码也不算多,
importjava.util.Scanner;
publicclass计算器{
	privatestaticScannersc=newScanner(System.in);
	publicstaticvoidmain(String[]args){
		init();
	}
	privatestaticvoidinit(){
		while(true)
			sop(input());
	}
	privatestaticStringinput(){
		sop("请输入运算表达式如:1+1回车!");
		Stringstr=sc.nextLine(),sum="";
		chartem=0;
		intpoin=0;
		for(inti=0;i<str.length();i++){//遍历!
			charcs=str.charAt(i);
			if(cs=='+'||cs=='-'||cs=='*'||cs=='/'){//寻找找运算符号
				tem=str.charAt(i);//记录运算符号!
				poin=i;//记录符号位置!
				break;
			}elseif(i>=str.length()-1){
				sop("输入不合法请检查!");
				init();
			}
		}//拆分数字!
		doublea=Double.parseDouble(str.substring(0,poin));
		doubleb=Double.parseDouble(str.substring(poin+1));
		switch(tem){//开始判断运算!
		case'+':
			sum=""+(a+b);
			break;
		case'-':
			sum=""+(a-b);
			break;
		case'*':
			sum=""+(a*b);
			break;
		default:
			sum=""+(a/b);
			break;
		}
		returnstr+"="+sum;
	}//打印功能!
	privatestaticvoidsop(Objectobj){
		System.out.println(obj);
	}
}

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