Reference no: EM133694400
Question: The CPU control unit determines the address in the memory to drive the value. Therefore, both variables num1 and num2 are stored in the Memory. To calculate the sum of num1 and num2 (line 3 in the program) would require four instructions:
Read num1 from Memory and put it in the register Input-1
Read num2 from Memory and put it in the register Input-2
Use the ALU to add the two values in Input-1 and Input-2 and write the sum to the register Output
Write the data from the register Output to the variable sum in Memory
We can express these operations using the following syntax:
READ [Source] [Destination]: Read the data from the source to the destination
WRITE [Source] [Destination]: Write the data from the source to the destination
ADD [Operand 1] [Operand 2]: Add the values in two operands and put the sum in the register Output
SUB [Operand 1] [Operand 2]: Subtract the value of Operand 2 from the value of Operand 1 and put the difference in the register Output
MUL [Operand 1] [Operand 2]: Multiply the values in two operands and put the product in the register Output
Using the notation above, sum the two numbers in num1 and num2 and put the total in the variable sum can be written as:
READ num1 Input-1
READ num2 Input-2
ADD Input-1 Input-2
Write Output sum
This notation is a type of programming language known as assembly language, in which the programmer specifies the sequence of instructions using only the fundamental operations of the computer. This is how early programmers had to write their programs.
Problem 1 (0.5 point)
Suppose you have a program that calculates the inventory for a dealership. The current number of cars you have by yesterday is stored in variable X, the number of cars you sold is stored in variable Y, and the number of new cars you get today is stored in variable Z. To calculate the number of cars you have by the end of today, you can subtract Y from X, then add Z, and store the result in variable R. Please Fill in the blanks with the necessary instructions for this calculation.
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