PROGRAMMING:C programming experiment 2-1
Calculate and output the absolute value of a real number. Input a real number arbitrarily from the keyboard, calculate and output the absolute value of the real number without using the absolute value calculation function.
###Input format:
Enter any real number.
###Output format:
The absolute value of the output contains two decimal places.
###Input example:
```in
-2.5
```
###Output example:
```out
two point five zero
```
answer：If there is no answer, please comment
###Input format:
Enter any real number.
###Output format:
The absolute value of the output contains two decimal places.
###Input example:
```in
-2.5
```
###Output example:
```out
two point five zero
```
answer：If there is no answer, please comment