Question

LILLLL Divesh Balamurugan Procedures and Parameters (Level 3) Mar 27, 4:11:21 PM Determine what is printed by the following code. PROCEDURE F(x, y) 3 RETURN 2*G(x, y) 6 PROCEDURE G(x, y) 8 RETURN X - y ans - 3*F(4, 2) DISPLAY (ans)

Answer 1

This is a simple algorithm of calling functions or methods.

The answer will be -12. How? Let's see.

In any algorithm of calling functions firstly, we should see from where the function is being called.

In the above algorithm Line-11 is calling the function F.

And, while returning the result it is calling the function G.

So first we will see Line 11.

1. ans <-- -3*F(4,2)

The function F is called with parameters 4 and 2. Then the result of this function will be multiplied with -3 for the answer.

2. In Line 1,

Procedure F(x,y)

The function F has 2 values x=4 and y=2. These are the values that we passed in the parameters while calling Function F in line 11.

3. The return statement in function F calls another function G with the same parameters.

In function G,

Return x-y

means it will return the difference of x and y where x=4 and y=2 as passed in parameters.

So 4-2=2. It will return 2 to the function F.

4. Now we will get back to Function F return statement

Return 2*G(x,y)

and G(x,y)=2 that we just solved.

So, 2*2=4 which will be returned to Line 11.

5. Coming back to Line 11

-3*4=-12 which will be allocated to ans

In Line 12 it displays the ans which is -12.