CAT 1999 | Question: 101

Question

Answer the question based on the following information.
A robot moves on a graph sheet with X and Y-axis. The robot is moved by feeding it with a sequence of instructions. The different instructions that can be used in moving it, and their meanings are:

Instruction	Meaning
GOTO (x,y)	Move to point with coordinates (x, y) no matter where you are currently.
WALKX(p)	Move parallel to the X-axis through a distance of p, in the positive direction if p is positive, and in the negative direction if p is negative.
WALKY(p)	Move parallel to the Y-axis through a distance of p, in the positive direction if p is positive, and in the negative direction if p is negative.

The robot reaches point $(6, 6)$ when a sequence of three instructions is executed, the first of which is a GOTO(x,y) instruction, the second is WALKX$(2)$ and the third is WALKY$(4)$. What are the value of x and y?

• A. $2, 4$
• B. $0, 0$
• C. $4, 2$
• D. $2,2$

Answer 1

option C (4,2)

1. We can go in reverse order first walky(4)
move parallel to y axis down by 4 (reached at (6,2)

2. now walkx(2)
move parallel to x axis left by 2 (reached at (4,2)

this is the desired point goto (4,2)