switch\case

#include <stdio.h> 
int main(void) {
  int balance = 2000 ;
  int amount = 0, operation = 0, transfer = 0 ;
  printf("Your balance is %d\n", balance) ;
  printf("Choose your operations:\n") ;
  printf("Choose '1' for withdraw:\n") ;
  printf("Choose '2' for deposit:\n") ;
  printf("Choose '3' for transfer:\n") ;
  printf("Choose '4' for refund the card:\n") ;
  scanf("%d", &operation) ;

  switch(operation) {
    case 1 :
    printf("Enter your withdraw:\n") ;
    scanf("%d", &amount);
    if (balance >= amount) {
    balance = balance - amount ;
    printf("Your operation is succesfull:\n") ;
    printf("Balance is %d\n", balance);
  }else {if (balance < amount){
    printf("You are poor.\n") ;
}}  break ;
    case 2 :
    printf("Enter your deposit:") ;
    scanf("%d", &amount) ;
    balance = balance + amount ;
    printf("Your balance is :%d", balance) ;
    break ;
    case 3 :
    printf("Enter your transfer value:\n") ;
    scanf("%d",&transfer) ;
    if (balance >= transfer) {
    balance = balance - transfer ;
    printf("Your operation is succesfull:\n") ;
    printf("Balance is :%d\n",balance) ;
  }else {if (balance < transfer){
    printf("Your money is not enough for this operation:\n");
}}  break ;
    case 4 :
    printf("Your card is succesfully refund.\n") ;
    break ;
    default :
    printf("Please enter a valid number.\n") ;
}    
  return 0 ;
}