http://kor.i2p/books/The%20C%20Programming%20Language%20by%20K&R/chapter1.html
For the moment, we will assume that both
functions are in the same file, so whatever you have learned about running C
programs will still work. The function power is called twice by main , in the line printf("%d %d %d\n", i, power(2,i), power(-3,i)); Each call passes two arguments to power , which each time returns an
integer to be formatted and printed.