Local variable vs global variable in C

Following are the differences between a local

 variable and global variable:

Local variable                                       

• Declaration:

A variable which is declared inside the function

 or block is known as a local variable.

• Scope:

The scope of a variable is available within a

 function in which they are declared.

• Access:

Variables can be accessed only by those

 statements inside a function in which

 they are declared.

• Life:

Life of a variable is  created  when the function

 the block is entered and destroyed on its exit.

• Storage

Variables are stored in a stack unless

 specified.

• Example:

void function1(){

int x=10;

}

    Global variable

• Declaration:

 A variable which is declared outside function or block is known as a global variable.

• Scope:

The scope of a  variable is available throughout the program.

• Access:

Any statement in the entire the program 

can access variables.

• Life:

Life of a variable exists until the program 

is executing.

• Storage

The compiler decides the storage location

 of a variable.

• Example:

int value=20;

void function1(){

int x=10;

}