SimpleCalculator | Topcoder Archive

Problem Statement

A simple calculator accepts the following kinds of strings as input:

1) NUM+NUM
2) NUM-NUM
3) NUM*NUM
4) NUM/NUM

where NUM is a positive integer, between 1 and 10000 inclusive that can contain leading zeros. Return the value produced by the given expression. Here +,-,*, and / denote addition, subtraction, multiplication and division respectively. All operations are done on integers, so "5/3" returns 1.

Definition

Class:: SimpleCalculator
Method:: calculate
Parameters:: String
Returns:: int
Method signature:: int calculate(String input)
(be sure your method is public)

Constraints

input will contain between 3 and 50 characters inclusive.
input will have the form <NUM><OP><NUM> where<NUM> is a positive integer between 1 and 10000 inclusive, that may contain leading zeros and <OP> is one of (quotes for clarity) '+','*','-', or '/'.
input will not contain any spaces.

Examples

```
"5/3"
```
```
Returns: 1
```
Remember integer division is used, so results are truncated.
```
"15*3"
```
```
Returns: 45
```
```
"1-10000"
```
```
Returns: -9999
```
Negative results are allowed.
```
"17+18"
```
```
Returns: 35
```

"0000000000000018/00000000000000000009"

Returns: 2

The long way of writing 18/9.

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