/* --------------------------------------------------------------------- 
**  Figure 20.4: Using function pointers.
** --------------------------------------------------------------------- 
*/
#include "tools.h"              /* contains definition of type string */

#define CHOICES  7

typedef double (*dubl_2dubl)( double, double );
typedef double (*funcptr)( double ); 

double log_2(double x) { return log(x)/log(2); }

void main( void )
{   
    dubl_2dubl fp = pow;   
    funcptr gp = exp;  

    printf( " 3^5 = %g\n",  fp( 3.0, 5 ) );
    printf( " e^5 = %g\n",  gp (5 ) );

}