EALU Starter Template for Midterm Checkpoint

ealu.c

/* EALU starter file for CSC 335 Midterm Checkup.
 * CC0 2014 by Matt Jadud
 * Compile with:
 *   gcc -o ealu ealu.c
 * and execute then with
 *   ./ealu
 */
 
#include <stdint.h>
#include <stdio.h>

#define ERROR 0xFFFF

uint16_t alu (uint16_t x, uint16_t y, uint8_t instr) {
  
  /* Your code to implement the extended ALU goes here. */
  /* Please use a switch statement. */
  /* The default case should return the value ERROR. */
  /* literally,
   *
   * default:
   *    return ERROR;
   *    break;
   */
}

int main () {
  
  uint16_t x, y;
  uint8_t instr;
  int error = 0;
  
  /* Some simple tests. */
  printf ("Tests for the EALU\n");
  printf ("------------------\n");
  
  if (!(alu(0x0042, 0xBEEF, 0x2A) == 0)) {
    printf ("The EALU should return 0 in this case.\n");
    error += 1;
  }
  
  if (!(alu(0x02, 0x02, 0x1F) == 0x03)) {
    printf ("The EALU should return x+1, which is 2+1, or 3, in this case.\n");
    error += 1;
  }
  
  /* You should write additional tests.
   * Your tests should only be noisy in the case of failure.
   */
  
  /* The following code should not need modification. It prints
   * the results of your tests. 
   */
  if (error > 0) {
    printf ("The EALU failed to pass %d test", error);
    
    /* Proper plurality agreement is so difficult when writing code... 
     * Good Grammar Or Bust! *cough*
     */
     
    if (error > 1) {
      printf ("s.\n");
    } else {
      printf (".\n");
    }
  } else {
    printf ("All tests passed!\n");
  }
  
  /* We can return anything here, so I choose to return the meaning of life,
   * the universe, and everything, as defined by Doubglas Adams. 
   * Zero, of course, is traditional, and suggests everything worked OK.
   */
  return 0x2A;
}