Consider the C struct defines below struct data int marks 100 char grade int cnumber struct data student gate computer science 2017
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Data-structure-with-C-10CS35-unit-3-->View question


Consider the C struct defines below: struct data { int marks [100] ; char grade; int cnumber; }; struct data student; -gate computer science 2017

The base address of student is available in register R1. The field student.grade can be accessed efficiently using
A) Post-increment addressing mode. (R1)+
B) Pre-decrement addressing mode, -(R1)
C) Register direct addressing mode, R1
D) Index addressing mode, X(R1), where X is an offset represented in 2’s complement 16-bit representation.



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Answers

D) Index addressing mode, X(R1), where X is an offset represented in 2’s complement 16-bit representation.

Explanation: 
The address of student grade can only be accessed by using the base address of Student.
Post-increment addressing mode. (R1)+ - Will give the next address and not the desired grade address
Pre-decrement addressing mode, -(R1) - Will give the previous address and not the desired grade address
Register direct addressing mode, R1 : In this mode, the address of the operand is embedded in the instruction code.
Index addressing mode: It is the only mode which gives access to next address by adding displacement in base address using displacement mode. . Base register contains a pointer to a memory location. An integer (constant) is also referred to as a displacement. The address of the operand is obtained by adding the contents of the base register plus the constant.
Therefore, option D is correct

deepuckraj

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