#include <stdio.h>

int get_currency_type(int);
float process_euros (float);
float process_yen (float);
float process_pesos (float);

 int main(void){
 
 int currency_type = 0;
 float currency_amount = 0;
 float dollars = 0;

 currency_type = get_currency_type(currency_type);

 switch (currency_type)
 {
  case 1:
   printf ("\nInput amount of currency\n");
   scanf ("%f", &currency_amount);
   dollars = process_euros (currency_amount);
  break;

  case 2:
   printf ("\nInput amount of currency\n");
   scanf ("%f", &currency_amount);
   dollars = process_yen (currency_amount);
  break;

  case 3:
   printf ("\nInput amount of currency\n");
   scanf ("%f", &currency_amount);
   dollars = process_pesos (currency_amount);
  break;

  default:
   printf("Incorrect value input, please try again\n");
   return 0;
  break;
 }

 printf ("\nThat is equal to $%.2f\n", dollars);

 return 0;
}

 int get_currency_type(int currency_type){
  printf ("Input type of currency\n");
  printf ("(1) Euros\n");
  printf ("(2) Yen\n");
  printf ("(3) Pesos\n");
  scanf ("%d", &currency_type);
  return (currency_type);
 } 

 float process_euros(float currency_amount){
  float dollars = 0;
  dollars = currency_amount * 1.227;
  return (dollars);
 }

 float process_yen(float currency_amount){
  float dollars = 0;
  dollars = currency_amount * 0.009031;
  return (dollars);
 }

 float process_pesos(float currency_amount){
  float dollars = 0;
  dollars = currency_amount * 0.08760;
  return (dollars);
 }