PROGRAMMING:A divided by B

It's really a simple problem. Given two integers $$a $$and $$B $$with absolute value less than 100, you are required to output the result in the format of "$$a / b = $$quotient".
###Input format:
Enter two integers in the first line, $$a $$and $$B $$($- 100, Le a, B, Le 100 $$), separated by spaces.
###Output format:
Output the result in one line: if the denominator is positive, output "$$a / b = $$quotient"; If the denominator is negative, the denominator should be enclosed in brackets for output; If the denominator is zero, the quotient of the output should be 'error'. The quotient of the output should be 2 decimal places.
###Input sample 1:
```in
-1 2
```
###Output sample 1:
```out
-1/2=-0.50
```
###Input example 2:
```
1 -3
```
###Output example 2:
```
1/(-3)=-0.33
```
###Input sample 3:
```
5 0
```
###Output example 3:
```
5/0=Error
```






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