What is the difference between the declaration and the definition of a variable?
The definition is the one that actually allocates space, and provides an initialization value, if any.
There can be many declarations, but there must be exactly one definition. A definition tells the compiler to set aside storage for the variable. A declaration makes the variable known to parts of the program that may wish to use it. A variable might be defined and declared in the same statement.
The definition is the one that actually allocates space, and provides an initialization value, if any.
There can be many declarations, but there must be exactly one definition. A definition tells the compiler to set aside storage for the variable. A declaration makes the variable known to parts of the program that may wish to use it. A variable might be defined and declared in the same statement.