HW17
COP-3223H

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1. (hw17-1.c) Hand-copy yourself without copy-and-paste the following program into a file on eustis and compile and run it.

   #include <stdio.h>
   #include <unistd.h>
   #include <assert.h>
   
   int main(int argc, char **argv) {
     int width = 40;
     int height = 20;
     int x = 0;
     int y = 0;
     int dx = 1;
     int dy = 1;
     while (1) {
       printf("\033[2J");
       printf("\033[H");
       printf("\033[%d;%dH", y, x);
       switch ((x * y) % 7) {
       case 0:
         putchar('.');
         break;
       case 1:
         putchar('*');
         break;
       case 2:
         putchar('%');
         break;
       case 3:
         putchar('#');
         break;
       case 4:
         putchar('@');
         break;
       case 5:
         putchar('-');
         break;
       case 6:
         putchar('+');
         break;
       default:
         assert(0);
         break;
       }
       putchar('\n');
       if ((0 <= (x + dx)) && ((x + dx) < width)) {
         dx = dx;
       } else {
         dx = dx * -1;
       }
       if ((0 <= (y + dy)) && ((y + dy) < height)) {
         dy = dy;
       } else {
         dy = dy * -1;
       }
       printf("\033[%d;%dH", height + 1, 0);
       printf("y: %d\n", y);
       printf("x: %d\n", x);
       x = x + dx;
       y = y + dy;
       usleep(50 * 1000);
     }
   }
   

   Describe in a comment what the effect of the switch statement is in this program.

2. (hw17-2.c) Write a program, using putchar's to write characters and newlines '\n' to print the word "computer" in a vertical "line" of characters, using a while loop and a switch statement. Loop over the values of x for 0 to 8 (exclusive), and use a switch statement that tests the value of x. Use putchar to print each character of "computer" and a newline using a switch statement according to the following table:

   Case	Output
   0	'c'
   1	'o'
   2	'm'
   3	'p'
   4	'u'
   5	't'
   6	'e'
   7	'r'

   The output should look like this:

   c
   o
   m
   p
   u
   t
   e
   r
   

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