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Q. Define Keyword and Identifiers?
Keyword: A keyword is a statement which defines nature of that statement. If statement is a directive then keyword would be the title of that directive whereas if the statement is data-allocation statement then keyword would be a data definition type.
Some illustrations of keywords are: SEGMENT (directive), MOV (statement) etc.
Identifiers: An identifier is a name which you apply to an item in your program which you expect to reference. The 2 kinds of identifiers are label and name.
1. Name denotes to address of a data item like counter, arr etc.
2. Label denotes to address of our instruction or process or segment. For illustration
MAIN is the label for a process as below:
MAIN PROC FAR
A20: BL,45 ; defines a label A20.
Identifier may employ alphabet, digit or special character but it always starts with an alphabet.
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Propositional model: Hence a propositional model was simply an assignments of truth values to propositions. In distinguish, a first-order model is a pair (Δ, Θ) where
Half Adder (for addition of two bits) Full Adder (for addition of three bits) Carry look ahead adder Carry save adder Carry propagate adder
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