Read the introductory C programming handout, find your favorite C programming references, and write the following C programs for warmup. Hand in a source listing for the last program on this list (construction of the argv array from stdin) along with a description of how your program works and what test cases you used to validate your program.

See the Just Enough C section of the textbook web site for some C tutorials.

See also the Linus Torvald's Linux Kernel Coding Style Guide.

1. Write a C program to echo command line arguments passed to your program in the standard argv character array.

2. Write a C program to read and echo lines typed at the keyboard (stdin) until an EOF (^d) is typed at the keyboard in the first column. Use fgets. See man fgets. Notice in the man page the #include that you must put at the beginning of your program when you use fgets.

3. Write a C program to read a line on stdin and then copy it into another character array buffer removing whitespace as you copy. Print out both buffers. See man isspace. Maybe you want to look at man string too.

4. Write a C program to read a line on stdin and then copy just the first word on the line (skipping leading white spaces) into another character array buffer. Print out both buffers.

5. Scan all words on a single input line from stdin and print them out on separate lines. Use whitespace as a delimiter (eg: nl, tab, sp).

6. Finally, scan all words on a single input line from stdin, store them in a string array called argv and then echo the argv string array.

7. If you have not used dynamic memory allocation, then modify your program to dynamically allocate all or part of your space for the argv array using malloc or calloc. You'll need to get used to dynamic memory allocation and management. See man malloc. Sort the words in the array if you're feeling energetic.