#include <stdio.h>

void useLocal( void ); //function prototype
void useStaticLocal( void ); //function prototype
void useGlobal( void ); //function prototype

int x = 1; //global variable

int main()

{   // start scope
    int x = 5;

    printf( "local x in outer scope of main is %d\n" , x );

    {   //start new scope
        int x = 7; //local variable to  new scope

        printf( "local x in inner scope of main is %d\n" , x );
    }   //end new scope
printf( " local x in outer scope is %d\n" , x );

useLocal(); //useLocal has automatic local x
useStaticLocal(); //useStaticLocal has static local x
useGlobal(); //useGlobal uses global x
useLocal(); //useLocal reinitializes automatic local x
useStaticLocal(); //static local x retains its prior value_type
useGlobal(); //global x also retains its value

printf( "\nlocal x in main is %d\n" , x );
} //end main

void useLocal( void )
{
    int x = 25; // initialized each time useLocal is called

    printf( "\nlocal x is useLocal is %d after entering useLocal\n" , x );
    ++ x;
    printf( "local x in useLocal is %d before exiting useLocal \n" , x );

} //end function useLocal

//useStaticLocal initializes static local variable x only the first time_base
//the function is called; value of x is saved between calls to this
//function
void useStaticLocal ( void )
{
    // initialized once before program startup
    static int x = 50;

    printf( "\nlocal static x is %d on entering useStaticLocal\n" , x );
    ++ x;
    printf( "local static x is %d on exiting useStaticLocal\n" , x );
} //end function useStaticLocal

//function useGlobal modifies global variable x during each call
void useGlobal( void )
{
    printf( "\nglobal x is %d on entering useGlobal\n" , x );
    x *= 10;
    printf( "global x is %d on exiting useGlobal\n" , x );
}// end function useGlobal