Question: What is the difference between declaration and definition of a variable?
Answer: Declaration specifies the properties of a variable. For example:
int x; /* x is an integer */ int roll_no; /* roll_no is an array of integers */
Definition declares a variable and causes the storage to be allocated. For example:
int x = 10; /* x is declared as an integer and allocated space and initialized to 10 */ int roll_no; /* roll_no is declared as an array of integers, allocated space for 100 integers */
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