Write an authentic code in C for the following instructions, WILL LEAVE A LIKE IF DONE WELL!!

Your entire program should be in a single file named "calc.c$"$

Your program must use standard C and must compile on linux.engrcs.com using the command

gcc $-$o calc calc.c

This is the command I will use to test your program, so make sure it works when compiled like that, i$.$e$.$

you should not require any additional switches etc.

If the first argument is not "sum" "prod" or "max" print an error message describing how the command

should be used, and exit.