Stop a for loop when user is finished entering input in c

Question

First of all, thank you for the assist!

I\'m new to the C language (and programming in general) and I\'m trying to write a program wherein the user inputs data point

Answer 1

No element of data[] will ever be 'done' (they're floats). If you want to scanf() directly, you'll need to choose a double value that ends the sequence (commonly zero or -1 or something). If that won't work, you can either use something like:

1. Use fgets() to pull a string, then strncmp() to check for the terminating value and sscanf() to pull out the double, or:
2. Have the user use Ctrl-D to terminate and check the scan value for EOF.

Oh, and strictly speaking you have an upper limit of entries. You should check i to make sure that you don't exceed that. Never assume your input won't exceed boundaries. sizeof() on a statically-allocated variable or some #defined macro to track that.