# Problem A

Calculator

## Input

Input contains several test cases, one per line. Each test case consists of an expression to be evaluated, containing numbers, parentheses, and the operators $+,-,*,/$.

Normal operator precedence applies, so multiplication and division bind harder than addition and subtraction. All operators evaluate left-to-right. Implicit multiplication is not possible, so $3(1+1)$ is not a valid input. There may be an arbitrary amount (including $0$) of spaces between tokens. Numbers are integers with absolute value at most $500$.

Input is terminated by end of file.

## Output

For each test case, output the value of the expression, with two digits of precision after the decimal point.

Sample Input 1 | Sample Output 1 |
---|---|

5 - 3-2 5- (3-2) 5 / 3 / 2 5 / (3 / 2) 1/3+1 1/(3+1) -4--2 (1-3)/(5+4) 2*3*5*7*11*13*17*19 -5/-5 |
0.00 4.00 0.83 3.33 1.33 0.25 -2.00 -0.22 9699690.00 1.00 |