Answer / nilam

Macros are preprocessor directives that are defined using #define directive. Macros consist of two parts Macro_Name, & Macro_Substitution_Text.
Before the source code gets complied, the preprocessor will check for the presence of macros. & wherever it found that macro simply replaces that macros with substitution text.

Macros are not Type Safe.

Answer / revathi

stack is a last in, first out (LIFO).It is characterized by only three fundamental operations: push, pop and stack top.

The queue is a First-In-First-Out (FIFO) data structure. In a FIFO data structure, the first element added to the queue will be the first one to be removed.

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