public bool AutorizarCompra (double valor, int parcelas, double saldo, double chequeEspecial)
bool Autorizar= SaldoDisponivel(saldo, chequeEspecial) >= CalcularTotalCompra(valor, parcelas);
public double CalcularTotalCompra (double valor, int parcela)
double juros = valor * parcela * 0.2;
double total = valor + juros;
public double SaldoDisponivel (double saldo, double chequeEspecial)
double contaBancaria = saldo + chequeEspecial;