You should make sure you have completed readLine before completing this task.

Download charIndex.c, or copy it into your current directory on a CSE system by running

$ cp /web/cs1511/17s2/week05/files/charIndex.c .

Start by copying your readLine code into the provided function stub.

You are given a main function which reads in a string and a character. You are to implement the int charIndex(char c, char *string) function which takes a character and a string and returns the index (position) of the first appearance of the character in the string. If the character doesn’t appear in the string, you are to return NOT_IN_STRING.

Some Examples

Enter a line: Hello, world!
Enter a character: w
Index of character 'w': 7

Enter a line: aaa
Enter a character: a
Index of character 'a': 0

Enter a line: aaa
Enter a character: b
Character 'b' is not in the string.

To run some simple automated tests:

$ 1511 autotest charIndex

To run Styl-o-matic:

$ 1511 stylomatic charIndex.c
Looks good!

You’ll get advice if you need to make changes to your code.

Submit your work with the give command, like so:

$ give cs1511 wk05_charIndex

Or, if you are working from home, upload the relevant file(s) to the wk05_charIndex activity on Give Online.