Scope of the variables in C++ provides the
accessibility of the variable. We have local, global, actual and formal
variables. Variables inside any function are local variables, they are
accessible to that function only. Variables declared outside any function main
also globally are called global variable, these variables can be accessed by
functions globally. Variable during function call are called actual variable
however, the variables that receives actual variables are called formal
variables. We have four types of storage types for the variables in C++ namely
auto, extern, register and static. This refers to the life of the variable
during the program execution, i.e. the birth and death of the variable, the
creation and destruction of the variable. By default all the variables are of
auto type, they exist till the time the block/function in which they have been
created/declared is active and dies as soon as the block/function is exit.
