/*
 * modswitch3.c
 * Project 1
 * Chapter 7
 * By John Stile
 *   Modify modswitch3a.c form chapter 6
 *   Put the program in a while loop until the user chooses 
 *   a new menu option to quit the program
 */
#include <stdio.h>

/* User-defined functions */
char ChooseMenu(void) // header for menu generator: returns char, takes nothing
{
  //system("clear");
  system("date");
  
  printf("************************************\n");
  printf("***Welcome to conversion world!***\n");
  printf("1) Converts Miles to Kilometers.\n");
  printf("2) Converts Kilometers to Miles.\n");
  printf("3) Convets Pounds to Kilograms.\n");
  printf("4) Converts Kilograms. to Pounds\n");
  printf("q) Quti the program\n");
  printf("\n\n");
  printf("Enter your menu choice: ");

  return getchar();
}

void mi2km(void) // header for miles to kilometers: returns nothin, takes nothing
{
  float mile;
  getchar();  // clean imput buffer
  printf("Enter a distance in Miles:");
  scanf("%f", &mile);
  printf("%.1f(Mi) is %.1f(Km)\n", mile, (mile*1.6) );
}

void km2mi(void)
{
  float kilo;
  getchar();
  printf("Enter a distance in Kilometers:");
  scanf("%f", &kilo);
  printf("%.1f(Km) is %.1f(Mi)\n", kilo, (kilo/1.6) );
}

void lb2kg(void)
{
  float pound;
  getchar();
  printf("Enter a weight in Pounds:");
  scanf("%f", &pound);
  printf("%.1f(lb) is %.1f(kg)\n", pound, (pound*0.45) );
}

void kg2lb(void)
{
  float kilogram;
  getchar();
  printf("Enter a mass in Kilograms:");
  scanf("%f", &kilogram);
  printf("%.1f(kg) is %.1f(lb)\n", kilogram, (kilogram/0.45) );
}

/* *** main function *** */
int main(void)
{
  char choice;

  while( choice=ChooseMenu() )
  {
    switch (choice)
    {
      case '1': mi2km();
                break;
   
      case '2': km2mi();
                break;
      
      case '3': lb2kg();
                break;
   
      case '4': kg2lb();
                break;
  
      case 'q': printf("Qutting program\n"); 
                return 0; 
  
      default:  printf("You entered an invalud choice.\n");
    }
    getchar(); // clear input buffer
    printf("\n\n");
  }

  return 0;
}