Get scanf to quit when it reads a newline?

Question

If I input 5 5 at the terminal, press enter, and press enter again, I want to exit out of the loop.

int readCoefficents(double complex *c){
             


        

Answer 1

re PAXDIABLO solution: it does not work properly with EMPTY line entered by user, so this line shall be added in your getLine() function

if (strlen(buff) <= 1) return NO_INPUT;

after the line:

if (fgets (buff, sz, stdin) == NULL)
    return NO_INPUT;

So it will become :

...
   if (strlen(buff) <= 1) return NO_INPUT;
   if (fgets (buff, sz, stdin) == NULL) return NO_INPUT;
....