public static float pedir_saldo_retirar(){
		float retirar=0;
		do{
			try{
			System.out.print("Saldo a retirar => ");
			BufferedReader stdin=new BufferedReader(new InputStreamReader(System.in));
			retirar=Float.parseFloat(stdin.readLine());
			if(retirar<1){
				System.out.println("El saldo a retirar debe ser mayor a 0€");
			}
			}catch(Exception e){
				System.out.println("Se espera un valor numerico "+e);
			}
		}while(retirar<1);
		return retirar;
	}