Question

When the following program finishes executing, the value of variable R1 is ( ). SET R1,4;INC R1;DEC R1;

A、3

B、4

C、5

D、6 

Answer 1

Answers: B, 4

According to the instructions in the program, first set the value of R1 to 4, then add 1 and subtract 1. 

Therefore, after executing these instructions, the value of R1 should still be 4. Options B, 4 are the correct answer.

Answer 2

This code is pseudocode, not specific programming language code. Pseudocode is a language used to describe algorithms, similar to a natural language, but simpler than the syntax of specific programming languages, and focuses more on expressing the logical structure of the algorithm.

In this pseudocode, the following directive is used:

SET R1, 4; —Sets the value of variable R1 to 4.
INC R1; - Adds 1 to the value of variable R1.
DEC R1; - Subtracts the value of variable R1 by 1.

What this pseudocode means is to first set the value of R1 to 4, then add 1 to the value of R1, and finally subtract the value of R1 by 1. Therefore, when this program is executed, the value of R1 should be 4.