/* Flat Washer Program */
/* Computes the weight of a batch of flat washers */
#include <stdio.h>
#define PI 3.14159
int
main(void)
{
double hole_diameter; /* input - diameter of hole */
double edge_diameter; /* input - diameter of outer edge */
double thickness; /* input - thickness of washer */
double density; /* input - density of material used */
double quantity; /* input - number of washers made */
double weight; /* output - weight of washer batch */
double hole_radius; /* radius of hole */
double edge_radius; /* radius of outer edge */
double rim_area; /* area of rim */
double unit_weight; /* weight of 1 washer */
/* Get the inner diameter, outer diameter, and thickness.*/
printf("Inner diameter in centimeters> ");
scanf("%lf", &hole_diameter);
printf("Outer diameter in centimeters> ");
scanf("%lf", &edge_diameter);
printf("Thickness in centimeters> ");
scanf("%lf", &thickness);
/* Get the material density and quantity manufactured. */
printf("Material density in grams per cubic centimeter> ");
scanf("%lf", &density);
printf("Quantity in batch> ");
scanf("%lf", &quantity);
/* Compute the rim area. */
hole_radius = hole_diameter / 2.0;
edge_radius = edge_diameter / 2.0;
rim_area = PI * edge_radius * edge_radius -
PI * hole_radius * hole_radius;
/* Compute the weight of a flat washer. */
unit_weight = rim_area * thickness * density;
/* Compute the weight of the batch of washers. */
weight = unit_weight * quantity;
/* Display the weight of the batch of washers. */
printf("\nThe expected weight of the batch is %.2lf", weight);
printf(" grams.\n");
return (0);
}
