Mid-course test

Functions in C

Here is a little program calling an external function. It has 3 files:

• the main function called callMySin.c:
  
  

• the function implementation mysin.c
  
  

• and the include file mysin.h
  
  

When you execute the program callMySin, what does it print?

Here is how I try to compile it: What am I doing wrong?

Can you write a Makefile to compile this program correctly?

Command line parameters:

I have a program named myProg which takes 4 parameters and which I execute as follows:

./myProg uli 65 ike 35

What is the value of:

• argc

• argv[0]

• argv[5]

• (argv[3])[1]

My program needs the second and forth parameter as integer values. As we have learned, the argv[x] however are strings. What do I have to do?

Write a piece of code that makes sure that the user enters exactly 4 parameters

How can I check if the first parameter is the string “uli” and the second one the string “ike”?

Makefiles

In the following Makefile which, builds the hello world program:

which elements are

• macros

• targets

• dependencies

What does $(RM) do?

What do $@ and $^ mean and, in the above Makefile example, into which values do these expand to?

-- Uli Raich - 2017-10-23

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