For this assignment, you will:

• Type in and compile the C program at the end of this assignment. The program asks the user to enter his or her name, then prints the ASCII value for each character in the name. Use vi or your favorite editor to enter the program, calling it name.c, then compile it on the main machines using the following command:
  
  cc -o name name.c
  
  
• Run the program by typing ./name at the Unix prompt, then entering your name at the prompt. When I run the program, I see this:

  Enter your name: Daniel Jimenez
  Your name is: Daniel Jimenez
  The ASCII values are: 68 97 110 105 101 108 32 74 105 109 101 110 101 122 
  

  Run the program again, this time redirecting output to a file called name.out. You can redirect output by running name like this:
  
  ./name > name.out
  
  This time, you won't be able to see the prompt, since it is going to the output file name.out, but enter your name anyway.
• Look at the output file using the cat command:
  
  cat name.out
  
  
• Send the professor the output file (not the program) through e-mail:
  
  mail -s "CS2073 Assignment 1" dj@cs.utsa.edu < name.out
  
  The less-than sign means input to the mail program is being redirected from the keyboard to the file name.out. You must run this command from your account on the main machines.

This assignment is due at midnight on Wednesday, January 28, 2009.

Here is the program you are to type in. Substitute your name where it says Your Name.

#include <stdio.h>
#include <unistd.h>

/*
 * Name: Your Name
 *
 * Class: CS 2073 section 2
 *
 * Purpose: 
 *    This program reads your name from standard input and prints
 * the decimal ASCII (American Standard Code for Information Interchange)
 * value for each letter.
 *
 * Input:
 *    A single string terminated by a carriage return.
 * 
 * Output:
 *    "Your name is" followed by the input string, then
 * "The ASCII values are:" followed by a space-separated list of
 * decimal integers representing the ASCII codes for each character
 * in the input string.
 */

void print_ascii (char *);

/*
 * main function
 * 
 * This is the main program.  It asks for your name, reads it into an array
 * of characters, and calls the `print_ascii' function to print the ASCII
 * values.
 */
int main (void) {
        char    name[100];

        /* prompt for the name */

        printf ("Enter your name: ");

        /* read the name into the string `name' */

        fgets (name, 100, stdin);

        /* print the name and ASCII values */

        printf ("Your name is: %s", name);
        printf ("The ASCII values are: ");
        print_ascii (name);

        /* leave the program with exit code zero */

        exit (0);
}

/*
 * print_ascii (char *)
 *
 * This function accepts a string and prints the ASCII value of each
 * character, then prints a newline
 */
void print_ascii (char *s) {
        int     i, a;

        /* let i start at zero and continue until the i'th character
         * in s is null or carriage return, i.e., the end of the string
         */

        for (i=0; s[i] && (s[i] != '\n'); i++) {

                /* convert s[i] to an integer and print it, 
                 * followed by a space
                 */

                a = (int) s[i];

		/* notice that there's a space after %d here */

                printf ("%d ", a);
        }
        
        /* print a newline */

        printf ("\n");
}