sp11-sl-e1 - ECE 3035 4 problems 7 pages Computing Mechanisms Exam One Spring 2011 23 February 2011 Instructions This is a closed book closed note exam

sp11-sl-e1 - ECE 3035 4 problems 7 pages Computing...

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ECE 3035 Computing Mechanisms Spring 2011 4 problems, 7 pages Exam One 23 February 2011 Instructions: This is a closed book, closed note exam. Calculators are not permitted. If you have a question, raise your hand and I will come to you. Please work the exam in pencil and do not separate the pages of the exam. For maximum credit, show your work. Good Luck! Your Name ( please print ) ________________________________________________ 1 2 3 4 total 28 22 20 30 100 1
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ECE 3035 Computing Mechanisms Spring 2011 4 problems, 7 pages Exam One 23 February 2011 Problem 1 (3 parts, 28 points) Pointers and Arrays The following variables are allocated in memory beginning at address 5000. Part A (10 points) Complete the memory map below with the variable names at each word or byte in memory. Do not include the variable’s value. int A[] = {11, 22, 33}; int B = 99; int *P = &(A[1]); char X[] = “Star”; char Y[] = “Shine”; char *R = Y; 5000 5004 5008 5012 5016 5020 5024 5028 5032 5036 5040 Part B (12 points) Using the variables in part A, give the values of each expression. Assume expressions are non-cumulative (i.e., they follow the declarations). Answers may be characters. A B P *P X[1] *(Y+2) R R[-2] Part C (6 points) Extract the array information from the code below. This code fragment accesses an array B[ k ][ j ][ i ] where i is in $4, j is in $5, and k is in $6. The array has 480 entries. The effective address for this access is computed in $1. addi $1, $0, 96 mult $6, $1 mflo $1 sll $2, $5, 5 add $1, $1, $2 add $1, $1, $4 sll $1, $1, 2 add $1, $1, $3 lw $2, 0($1) What is the most likely type of array B? What are the three defined dimensions? B[ ] [ ] [ ]; What register has the base address of B?
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