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CS 2733/2731  Computer Organization II  Fall 2004  Recitation 4  Loops and Arrays in Mips     Week 4: Sep 13-17  Due (on time): 2004-09-22  23:59:59  Due (late):        2004-09-26  23:59:59

Recitation 5 must be submitted following directions at: submissions on or before 2004-09-22  23:59:59 (that's Wednesday, 22 September 2004, 11:59:59 pm) for full credit. 2004-09-26  23:59:59 (that's Sunday, 26 September 2004, 11:59:59 pm) for 75% credit.

Outline: Write a MIPS program that uses two integer arrays (A and B) of size 10. The program should do that following:

• Allocate space for A and give it the initial values of 1, 3, 5, 7, 9, 11, 13, 15, 17, 19.
• Allocate space for B without initial values (in MIPS the values end up as 0).
• Output a prompt for an integer N as below: "Enter N:".
• Read in the value of N (a number between 0 and 10).
• If N is not in the range from 0 to 10 inclusive, output the message "N out of range" and terminate.
• Compute the first N values of B as the accumulation of the values of the array A (e.g. B[i] is A[0] + A[1] + ... + A[i]), as shown in the c program below. Note: You must use a loop to implement this.
• Using a separate loop output the first N values of the array B.

% cat rec5.c
#include <stdio.h>
#include <stdlib.h>

void main(void) {
   int A[10] = { 1,  3,  5,  7,  9,
                11, 13, 15, 17, 19};
   int B[10];
   int N;
   int OldB;
   int i;
   printf("Enter N:");
   scanf("%i", &N);
   if (N < 0 || N > 10) {
      printf("N out of range\n");
      exit(1);
   }
   i = 0;
   OldB = 0;
   while (i < N) {
      B[i] = OldB + A[i];
      OldB = B[i];
      i = i + 1;
   }
   i = 0;
   while (i < N) {
      printf("%i", B[i]);
      printf(" ");
      i = i + 1;
   }
   printf("\n");
}

% rec5
Enter N:10
1 4 9 16 25 36 49 64 81 100 
% rec5 
Enter N:5
1 4 9 16 25 
%lab5
Enter N:0

% rec5
Enter N:-1
N out of range
% rec5 
Enter N:11
N out of range

Contents of submission for Recitation 4: Last Name, First Name; Course Number; Recitation Number (4). MIPS source code for the program. Log of runs of the program, using spim and the input data shown above for the separate runs, namely, 10, 5, 0, -1, and 11.