NIMCET 2009 — Computer PYQ

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Question

NIMCET 2009 — Computer PYQ

NIMCET | Computer | 2009

To change upper case to the lower case letter in ASCII, correct mask and operation should be

Choose the correct answer:

Explanation

To understand how to convert uppercase to lowercase in $ASCII$ , we look at the binary patterns of the characters:

ASCII Pattern: In the $ASCII$ table, the difference between an uppercase letter and its lowercase counterpart is exactly $32$ in decimal.
- Example: 'A' is $65$ ( $01000001$ in binary).
- Example: 'a' is $97$ ( $01100001$ in binary).
The Bit Difference: If you compare the two binary strings, the only difference is at the 6th bit (the bit representing $2^{5} = 32$ ).
- Uppercase has a $0$ at the 6th bit.
- Lowercase has a $1$ at the 6th bit.
The Operation: To change a $0$ to a $1$ while keeping all other bits the same, we use the bitwise $OR$ operation with a mask that has a $1$ only at the target position.
- Mask: $0100000$ (which is $32$ in decimal).
- Calculation: $'A' (01000001) \text{ OR } 0100000 = 01100001 ('a')$ .

Thus, using the mask $0100000$ with the $OR$ operation correctly performs the conversion.