A Simple String Program

Task:

Read a line of test. Print the even numbered words on one line, then print the odd numbered words on the next line.

We will consider the words numbered as:

     word0  word1  word2  ...

where words are sequences of characters separated by spaces. For example, we could run the program:

     ee150:wiliki:45> word
     this is a longer string

and the output would be:

     this a string
     is longer

This is an example of a program where we need to use and array, because we must make two passes over the characters in the string. The first time we print the even words, the second time we print the odd words.

Algorithm for main()

     get a string
     print the even words
     print a newline
     print the odd words
     print a newline

We will implement each of these steps as a function, so we could write the code right now for main in word.c with a macro defined in word.h.

We therefore need two functions, print_even() and print_odd. We know what they must do. Their prototypes are in evenodd.h.

We can build this program using the makefile.

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