FILE 0-print_name.c is a function that prints a name.
FILE 1-array_iterator.c is a function that executes a function given as a parameter on each element of an array.
FILE 2-int_index.c is a function that searches for an integer.
FILES 3-main.c, 3-op_functions.c, 3-get_op_func.c, 3-calc.h are all part of a program that performs simple operations.