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简单计算器

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 47718    Accepted Submission(s): 16695


Problem Description
读入一个只包含 +, -, *, / 的非负整数计算表达式,计算该表达式的值。
 

Input
测试输入包含若干测试用例,每个测试用例占一行,每行不超过200个字符,整数和运算符之间用一个空格分隔。没有非法表达式。当一行中只有0时输入结束,相应的结果不要输出。
 

Output
对每个测试用例输出1行,即该表达式的值,精确到小数点后2位。
 

Sample Input
1 + 2 4 + 2 * 5 - 7 / 11 0
 

Sample Output
3.00 13.36
 

Source
 

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