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June 16th, 2018, 05:34 AM   #1
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How to solve this coding problem?

In a certain code @ represents 0, # represents 1, @ represents 2 and ## represents 3 and so on.

Which of the following represents 13 in this code language?

a) #@#@

b) ##@@

c) ###@

d) ##@#

e) ###

1 means # and ## means 3, combining them. It looks ###.

My answer is ###, but it is wrong. Right answer is option D. How so?
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June 16th, 2018, 05:46 AM   #2
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It seems to be simple binary representation
##@# ---> 1 1 0 1 (Binary) -> 13(Decimal)
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June 16th, 2018, 05:58 AM   #3
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Quote:
Originally Posted by MathsLearner123 View Post
It seems to be simple binary representation
##@# ---> 1 1 0 1 (Binary) -> 13(Decimal)
How 1101 equals to 13?
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June 16th, 2018, 06:04 AM   #4
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Can you please search for Binary to Decimal conversion.
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June 16th, 2018, 06:19 AM   #5
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Quote:
Originally Posted by MathsLearner123 View Post
It seems to be simple binary representation
##@# ---> 1 1 0 1 (Binary) -> 13(Decimal)
How you got the idea of binary to decimal conversion?
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June 16th, 2018, 06:33 AM   #6
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May be experience.
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June 16th, 2018, 08:54 AM   #7
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Quote:
Originally Posted by Ganesh Ujwal View Post
In a certain code @ represents 0, # represents 1, @ represents 2 and ## represents 3 and so on.
I assume that was intended to say that #@ represents 2.
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June 16th, 2018, 04:04 PM   #8
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Quote:
Originally Posted by Ganesh Ujwal View Post
How you got the idea of binary to decimal conversion?
oh FFS at this point there is no way you aren't trolling.
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June 20th, 2018, 06:19 AM   #9
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Decimal system -> each digit represents powers of ten (read right to left)

e.g. look at the decimal number 257

$\displaystyle 257 = 7 \times 10^0 + 5 \times 10^1 + 2 \times 10^2$

Binary system -> each digit represents powers of two (read right to left)

$\displaystyle 1101 = 1 \times 2^0 + 0 \times 2^1 + 1 \times 2^2 + 1 \times 2^3$

We can calculate this using decimal notation:

$\displaystyle 1 \times 2^0 + 0 \times 2^1 + 1 \times 2^2 + 1 \times 2^3 = 1 + 4 + 8 = 13$

There are websites which have very good ways of explaining binary and decimal number systems.
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