PROGRAMMING:Four simple operations
Read in a real number, an operator (only + - * /) and a real number to find the value of the expression. If divisor is 0, output "the divisor is 0."
###Input format:
Read in operands, operators, operands
###Output format:
Output the value of the expression (to two decimal places). If divisor is 0, output "the divisor is 0."
###Input example:
```in
4/8
```
###Output example:
```out
zero point five zero
```
answer：If there is no answer, please comment
###Input format:
Read in operands, operators, operands
###Output format:
Output the value of the expression (to two decimal places). If divisor is 0, output "the divisor is 0."
###Input example:
```in
4/8
```
###Output example:
```out
zero point five zero
```
answer：If there is no answer, please comment