Getting a substring in C

Question

I have a string in the following format: "R: 625.5m E:-32768m"

What's the most efficient way to pull out the 625.5?

Answer 1

Your best bet is to use sscanf to read formatted information from the string.

sscanf(mystr, "R: %f", &myFloat);

Answer 2

sscanf is a good candiate to parse simple strings with fixed format.