Solution Review: An Array of Function Pointers

# include <stdio.h>
void dbl ( int * ) ;
void tple ( int * ) ;
void qdpl ( int * ) ;
int main( )
{
	int  num = 2, i ;
	void ( *p[ ] )( int * ) = { dbl, tple, qdpl } ;
	for ( i = 0 ; i < 3 ; i++ )
	{
		p[ i ]( &num ) ;
		printf ( "%d\n", num ) ;
	}
	return 0 ;
}

void dbl ( int *n )  
{
	*n = *n * *n ;
}

void tple ( int *n )  
{
	*n = *n * *n * *n ;
}

void qdpl ( int *n )  
{
	*n = *n * *n * *n * *n ;
}