C++ #include #include class DollarAmount { public: // initialize amount from an int64_t value explicit DollarAmount(int64_t value) : amount{value} { } // add right's amount to this object's amount void add(DollarAmount right) { // can access private data of other objects of the same class amount += right.amount; } // subtract right's amount from this object's amount void subtract(DollarAmount right) { // can access private data of other objects of the same class amount -= right.amount; } // uses integer arithmetic to calculate interest amount, // then calls add with the interest amount void addInterest(int rate, int divisor) { // create DollarAmount representing the interest DollarAmount interest{ (amount * rate + divisor / 2) / divisor }; add(interest); // add interest to this object's amount } // return a string representation of a DollarAmount object std::string toString() const { std::string dollars{std::to_string(amount / 100)}; std::string cents{std::to_string(std::abs(amount % 100))}; return dollars + "." + (cents.size() == 1 ? "0" : "") + cents; } private: int64_t amount{0}; // dollar amoun
C++
#include <string>
#include <cmath>
class DollarAmount {
public:
// initialize amount from an int64_t value
explicit DollarAmount(int64_t value) : amount{value} { }
// add right's amount to this object's amount
void add(DollarAmount right) {
// can access private data of other objects of the same class
amount += right.amount;
}
// subtract right's amount from this object's amount
void subtract(DollarAmount right) {
// can access private data of other objects of the same class
amount -= right.amount;
}
// uses integer arithmetic to calculate interest amount,
// then calls add with the interest amount
void addInterest(int rate, int divisor) {
// create DollarAmount representing the interest
DollarAmount interest{
(amount * rate + divisor / 2) / divisor
};
add(interest); // add interest to this object's amount
}
// return a string representation of a DollarAmount object
std::string toString() const {
std::string dollars{std::to_string(amount / 100)};
std::string cents{std::to_string(std::abs(amount % 100))};
return dollars + "." + (cents.size() == 1 ? "0" : "") + cents;
}
private:
int64_t amount{0}; // dollar amount in pennies
};
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