PROGRAMMING:Division of two numbers

This topic seeks to input three positive integers, the first two integers do division, the third number is the exact number of decimal points, if the data read in error, output: data input error
###Input format:
Enter three positive integers m, N, D in one line, separated by blank space, m, N, D are less than or equal to 300000
###Output format:
Output the corresponding result of M / N, accurate to D decimal places
###Input example:
```in
171 2378 20
```
###Output example:
```out
0.07190916736753574432
```
###Input example:
```in
171 0 20
```
###Output example:
```out
data input error!
```







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