Final answer:
The student's question is about writing a program to calculate an expression z = (a + b) × (c - d), using a particular register mapping. The provided solution is not aligned with this question; instead, the student should focus on implementing the arithmetic operations using the correct assembly language syntax and programming logic.
Step-by-step explanation:
The question refers to writing a program that calculates the value of the expression z = (a + b) × (c - d), where the variables a, b, c, and d correspond to values stored in registers. The given values in the solution, a = 3, b = 13, and c = -10 (with d not provided), are incorrect for this context, as they represent an arithmetic expression not directly related to the mentioned registers. Instead, the program should use operations like addition and subtraction to calculate the values of the expressions (a + b) and (c - d), and then multiply these results to find z. Here's an example in pseudo-code:
LOAD R1, a // Load the value of 'a' into register R1
LOAD R2, b // Load the value of 'b' into register R2
ADD R3, R1, R2 // Add R1 and R2 and store the result in R3
LOAD R4, c // Load the value of 'c' into register R4
LOAD R5, d // Load the value of 'd' into register R5
SUB R6, R4, R5 // Subtract R5 from R4 and store the result in R6
MUL R7, R3, R6 // Multiply R3 and R6 and store the result in R7
STORE z, R7 // Store the result from R7 into variable 'z'
This example assumes a fictional assembly language and should be adapted to the specific syntax and registers of the target system.