Currency converter with a menu and loop to give user to chose other currency until user decides to quit.

I am trying to write a currency conversion using C programming. The program should contain a menu which displays the choice of currencies to be converted. The result should display something like this and it should loop until I decide to exit.
1) Mexican Pesos
2) Canadian Dollar
3) Euro
4) Japanese YEn
5) British Pound
6) Exit the program

Enter your selection (1-6) : 3
Enter the amount: 250

250 Euro = so much in US Dolllars.

Below is what I have done so far but no luck in getting the conversion. The program exits as soon as I pressed enter...look at below and help with the loop process and also the calculations,please. Thanks in advanced.

================================================================================


#include<stdio.h>
#include<stdlib.h>
      #define Swiss_Franc_rate 0.6072;       /*Swiss Franc rate*/
      #define British_Pounds_rate 1.4320;       /*British Pound rate*/
      #define Japanese_Yen_rate 0.0081;       /*Japanese Yen rate*/
      #define Canadian_Dollar_rate 0.6556;       /*Canadian Dollar rate*/
      #define Euros_rate 0.8923;


int main(void){
 
/*Declare floaters*/

float Swiss_Franc;            /*Swiss Franc*/
float British_Pounds;            /*British pounds*/
float Japanese_Yen;            /*Japanese Yen*/
float Canadian_Dollar;            /*Canadian Dollar*/
float Euros;                  /*European Union Euro*/
float USD;                  /*US Dollar*/
int   choice;

                    /*Title*/

printf("        Currency Conversion Program\n");

printf("----------------------------------------\n\n");


                   /*Menu*/

     printf("1)   Swiss Franc               \n");
     printf("2)   British Pound             \n");
     printf("3)   Japanese Yen              \n");
     printf("4)   Canadian Dollar           \n");
     printf("5)   Euro                      \n");
     printf("6)   Exit the Program          \n");

       
printf("\n");
printf("\n");

            /*Input from User*/

printf("Please enter your choice (1-6): ");
scanf("%d",&choice);

while((choice<1) || (choice>6)){
printf("Invalid entry, please Enter 1-6: ");
scanf("%i",&choice);
}
if(choice==1){
printf("Please the amount:  ");
scanf("%f",&Swiss_Franc);

      /*Conversion Calculation 1*/
Swiss_Franc = USD / Swiss_Franc_rate;

}
if(choice==2){
printf("Please enter the amount:  ");
scanf("%f",&British_Pounds);

      /*Conversion Calculation 2*/
British_Pounds = USD / British_Pounds_rate;
}

if(choice==3){
printf("Please enter the amount:  ");
scanf("%f",&Japanese_Yen);

      /*Conversion Calculation 3*/
Japanese_Yen = USD / Japanese_Yen_rate
}

if(choice==4){
printf("Please enter the amount:  ");
scanf("%f",&Canadian_Dollar);

      /*Conversion Calculation 4*/
Canadian_Dollar = USD / Canadian_Dollar_rate;
}

if(choice==5){
printf("Please enter the amount:  ");
scanf("%f",&Euros);

      /*Conversion Calculation 5*/
Euros = USD / Euros_rate;
}

if(choice==6){
printf("Exit the program:  ");

while (getchar() != '\n')
      continue;            
    goto top;              
  }                      
  printf("Goodbye!\n");
  return 0;

 }
    //Function
 
 void dashbar()                        
 {  
  int i = 1;                                  
  while (i < 50)                              
  {
     putchar ('-');                            
     i = i + 1;                              
  }
  putchar ('\n');                            
 }
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