Please read the homework guidelines before you proceed.

Part 1: Counting [30pts]

Using only the features of C you have learned in so far write a C program that takes text as input, and outputs the following:

the number of lines in the input
the number of characters in the input
the number of words in the input

Effectively, we're building the Unix program wc.

All characters, including the newline ('\n'), should be counted.  Assume that only space(s), newline characters, and tab characters seperate words. That is: ' ', '\n', and '\t'.

Input is terminated by entering CTRL-D at any time.  Recall that CTRL-D triggers an EOF.

Instead of typing long paragraphs to test your program, you can use text file using I/O redirection. I/O redirection on Unix converts text files to standard input for programs. For example, if the text is stored in a file, textinput, you can input it into the program (a.out) by using I/O redirection as follows:

$ ./a.out < textinput        (note that the $ denotes the command prompt; you would not type the $)

The results will then be printed on the screen. Alternately, you can do:

$ ./a.out < textinput > results

The results will be printed in a file called, results

Use the unix program wc to verify the correctness of your program.

Part 2: Sum of numbers as characters [70pts]

Your program must do the following:

• Take input from the user, one number (both integer and floating point numbers) on a line, until user types CTRL-D on its own line.
• Use EOF to detect end of input. In keyboard input, EOF is signaled by typing CTRL-D.
• Read the input as characters, one character at a time (i.e. use getchar() only).
• Remember that character digits are not integer digits, i.e. you must perform conversions between these.
• Once you have the digits in proper integer format, think of a way to convert a collection of digits into proper numbers, i.e. multiplying powers of 10 correctly.
• You should perform adequate error-checking to guarantee program robustness. Your program should not crash under any circumstances, this includes invalid or unreasonable inputs.
• You may assume however, that the user will not enter integers or floats in sizes bigger than machines can handle.
• Reading the numbers as doubles or integers and then adding them up earns 0 credit on this part.

Extra Credits (10 points):

1. Leading 0 in a floating point number is optional, that is, .4 and 0.4 are equivalent and both acceptable.
2. Handle negative numbers correctly.