Mock test, Q6

[Shubham Johri]

I don't understand why there is an error in line 20. We can take either the positive differences or negative difference of the marks. If value is 0 with positive differences, it will be 0 with negative differences as well.

[SUMIT ANTIL]

Same doubt here. Can someone please clarify?

[Snigdha Lele]

Yes I had the same doubt

On Thursday, November 12, 2020 at 9:10:31 PM UTC+5:30 Shubham Johri wrote:

[Antony]

The purpose of the proc is probably to return a positive value. Otherwise why to even compare C and D, you can just return c-d or d-c.

[Snigdha Lele]

No then you won't get the sum. some marks will get subtracted

[Antony]

Student1.Physics - Student2.Physics = 10

Student1.Maths - Student2.Maths = - (10)

Total diff, if you consider sign = 0 

Actual total diff = 20

On Thursday, November 12, 2020 at 9:10:31 PM UTC+5:30, Shubham Johri wrote:

[Naushad C.K.]

As per the logic it should return positive value. The proc/func should return the differential value in positive. 

[Shubham Johri]

There is no requirement for it to return positive value. The purpose is to check whether value=0, so whether we take positive or negative difference does not matter.

[Ajay k Gupta]

yes sir.it is never mentioned that we need value as difference ,which  needs to be postive , or it being 0 to be the method to check its equality.  the methods logic should fullfill correct requirement which is done.

also vallue isnt set to 0 in step 14 again. shouldnt it be

[Shubham Johri]

Value variable is being initialized with Proc2(X.Physics,Y.Physics) in the first line so it doesn't need to be set to $0$ at the end of the loop.

[cheria...@gmail.com]

Line 20 need not be considered an error.

If line 20 is left as it is. Proc2 will always return only a negative value or zero.

If the sign is the opposite, Proc2 will always return only a positive value or zero.

Error in line 1 : Z=0

Error in line 10 : value = value - Proc2(X.Total,Y.Total)

Line 20 can be left as it is and the pseudo code will generate the same outcome. Therefore Line 20 need not be considered an error.

Example :

Case 1: Leave line 20 as it is :

Proc2(X.Maths,Y.Maths) = -10

Proc2(x.Physics,Y.Physics) = -20

Proc2(X.Chemistry,Y.Chemistry) = -40

Proc2(X.Total,Y.Total)= -70

Line 10 = value = -70 - (-70) = 0

Case 2: Change the comparison operator line 20 :

Proc2(X.Maths,Y.Maths) = 10

Proc2(x.Physics,Y.Physics) = 20

Proc2(X.Chemistry,Y.Chemistry) = 40

Proc2(X.Total,Y.Total)= 70

Line 10 = value = 70 - 70 = 0