c-resources/CPlusPlus20ForProgrammers-m.../examples/ch10/fig10_34-40/Commission.cpp

47 lines
2.1 KiB
C++

// Fig. 10.37: Commission.cpp
// Commission member-function definitions.
#include <fmt/format.h>
#include <stdexcept>
#include "Commission.h" // class definition
// constructor
Commission::Commission(double grossSales, double commissionRate)
: m_grossSales{grossSales}, m_commissionRate{commissionRate} {
if (m_grossSales < 0.0) {
throw std::invalid_argument("Gross sales must be >= 0.0");
}
if (m_commissionRate <= 0.0 || m_commissionRate >= 1.0) {
throw std::invalid_argument(
"Commission rate must be > 0.0 and < 1.0");
}
}
// calculate earnings
double Commission::earnings() const {
return m_grossSales * m_commissionRate;
}
// return string containing Commission information
std::string Commission::toString() const {
return fmt::format("gross sales: ${:.2f}; commission rate: {:.2f}",
m_grossSales, m_commissionRate);
}
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