[jmak88]

I am relatively new to the programming world and was wondering if y'all could give me a hand with this lab. Pretty much it requires a user to press "+" or "-" until the two values (volumes of a cube and sphere) are equal, with the "+" or "-" changing the spheres value. The next loop would be the exact same thing except for the surface area of the cube to be changing. I'm unsure how to get the scan f working and if my loops are correct. Take a look and thanks!!

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

/* The prototype. */
char * prompt_and_get( char * prompt, char * response);

int main(){

  const double PI = atan2( 0.0, -1.0);
  double side, diameter, inp;
  double sphere_volume, sphere_surface, cube_volume, cube_surface, ratio_of_vol\
ume_to_surface_area_sphere, ratio_of_volume_to_surface_area_cube;
  double change;
  char * prompt_ptr, response[132], * response_ptr;

  double difference;

  printf("Enter a diameter and side separated by a space and followed by ENTER\\
n");
  scanf("%lf%lf", &diameter, &side);
  getchar();  /* get past the scanf pains */

  printf("You entered %10.2lf for the diameter and %10.2lf for the side\n",
         diameter, side);

  prompt_ptr = "Enter *, +, -, or simply ENTER: ";

  cube_volume = side * side * side;

  change = diameter;

  while(1){
    break;
    sphere_volume = PI * diameter * diameter * diameter / 6.0;
    printf("Sphere volume, cube volume %12.5lf %12.5lf\n",
           sphere_volume, cube_volume);

    difference = fabs(sphere_volume - cube_volume);
    if( (difference / sphere_volume) < 0.001  ) break;

    response_ptr = prompt_and_get( prompt_ptr, response );
 if( response[0] == '+' ){
      printf("A plus sign was entered\n");
      change = fabs( change ) * 0.5; }

    else if( response[0] == '-' ){
      printf("A minus sign was entered\n");
      change = -fabs( change) * 0.5; }

    else if( response[0]== '*' ){
      printf("Keeping change. %f\n", change); }

 else if( response[0] > ' ' ){
      printf("Why did you enter %s ?\n", response);
      continue; } /* Not quitting yet.*/

    else break;

    diameter = diameter + change;

    printf("Diameter is now %12.5lf\n", diameter);
    printf("Enter 0 to exit");
 scanf(&inp);
    if (inp == 0) break;
  }

    printf("Enter a side and a diameter by a space and followed by ENTER\n");
    scanf("%lf%lf", &side, &diameter);
    getchar();

    printf("You entered %10.2lf for the side and %10.2lf for the diameter\n",
           side, diameter);

 prompt_ptr = "Enter *, +, -, or simply ENTER: ";

    sphere_surface = PI * diameter * diameter;

    change = side;
    while(2){ break;
      cube_surface = 6.0 * side * side;
      printf("cube surface, sphere surface %12.5lf %12.5lf\n",
             cube_surface, sphere_surface);

      difference = fabs(cube_surface - sphere_surface);
      if( (difference / cube_surface) < 0.001  ) break;

      response_ptr = prompt_and_get( prompt_ptr, response );
      if( response[0] == '+' ){
        printf("A plus sign was entered\n");
        change = fabs( change ) * 0.5; }

      else if( response[0] == '-' ){
        printf("A minus sign was entered\n");
        change = -fabs( change) * 0.5; }

else if( response[0]== '*' ){/* Do not change change. */
        printf("Keeping change. %f\n", change); }

      else if( response[0] > ' ' ){/* strange input, expected
                                      + sign, minus sign, blank, or ENTER.*/
        printf("Why did you enter %s ?\n", response);
        continue; } /* Not quitting yet.*/

      else break;

      side = side + change;

      printf("side is now %12.5lf\n", side);
      printf("Enter 0 to exit");
      scanf(&inp);
      if (inp == 0) break;
    }

    ratio_of_volume_to_surface_area_cube = cube_volume / cube_surface;
    ratio_of_volume_to_surface_area_sphere = sphere_volume / sphere_surface;

 printf("%f ratio of volume to surface area in a cube\n %f ratio of volume t\
o surface area in a sphere\n", ratio_of_volume_to_surface_area_cube, ratio_of_v\
olume_to_surface_area_sphere);

    return 0; }

[fjf314]

Just so you know, using the code tags is your friend in this case. It'd be a lot easier to read through what you've got if the whitespace wasn't all messed up.

<CODE>

***paste your code here***

</CODE>

Just replace the <> with []