/*
 * Example of function with input arguments and a single result
 * 
 * scale function:   
 *                x --> x*10^n 
 * Hanly and Koffman, 5ed, page 132
 * 
 */

#include <stdio.h>
#include <math.h>

/* Function prototype */
double scale(double x, int n);

int
main(void)
{
     double num_1, xs; 
     int num_2;

     /* Get values for num_1 and num_2 */
     printf("Enter a real number> ");
     scanf("%lf", &num_1);
     printf("Enter an integer> ");
     scanf("%d", &num_2);

     /* function call */
     xs = scale(num_1, num_2);   

     /* display result */
     printf("Result of call to function scale is %f\n", xs); 

     return (0);
}

/* Function definition: scale function  */ 
double
scale(double x, int n)              	 
{
     double scale_factor, xs;     /* local variable - 10 to power n */

     scale_factor = pow(10, n);

     xs = x * scale_factor;
     return (xs);
}