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Use case of storage class identifier auto?I understand that all local variables are auto by default. But whats makes difference by writing explicitly auto int a ?
700
There is strictly no difference. The common practice is not to put the auto specifier.
auto variables (not to be confused with auto keyword) are typically non-static local variables. They are stored in what is usually called "stack" space. "Local variables are non existent in the memory after the function termination", You probably mean Scope, { , } and not function termination.
Automatic variables create a new each time when program's execution enters in the function and destroys when leaves. Static variable create once, when program's execution enters in the function first time, destroys when program's execution finishes, they do not again.
Variables are classified into Global variables and Local variables based on their scope. The main difference between Global and local variables is that global variables can be accessed globally in the entire program, whereas local variables can be accessed only within the function or block in which they are defined.
There is strictly no difference.
{
auto int a;
/* ... */
}
and
{
int a;
/* ... */
}
are equivalent.
The common practice is not to put the auto specifier.
100
There are two possible cases:
auto is the default, and explicitly adding the keyword accomplishes nothingauto isn't allowed (e.g., on a global variable) in which case adding auto prevents the code from compiling
42
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