#include #include #include // For pow(). using namespace std; const int YEARS = 20; const double INTEREST_RATE = 0.07; /** * Applies a given function, `func`, to each element of the list, `numbers`, and * returns a list of results in the same order. */ vector map(vector numbers, double (*func)(double)) { vector result(numbers.size()); for (int i = 0; i < numbers.size(); i++) { result[i] = func(numbers[i]); } return result; } /** * Returns the amount compounded annually at the given interest rate for the * given number of years, when provided an initial quantity, `principal`. */ double compound_interest(double principal) { return principal * pow(1 + INTEREST_RATE, YEARS); } /** * Returns the number of years until a person with the given income (and no * expenses) becomes a millionaire, taking investment returns into account. */ double years_until_millionaire(double n) { int years = 0; double money = 0; while (true) { ++years; money += n; money = money * (1 + INTEREST_RATE); if (money > 1000000) { return years; } } } double print_element(double n) { cout << n << ",\t"; return 0; } double times_a_thousand(double n) { return 1000 * n; } int main() { double (*func)(double) = times_a_thousand; cout << func(4) << endl << endl; vector salaries = {56, 84, 117, 145, 211}; vector salaries_k = map(salaries, times_a_thousand); cout << "Initial:\t"; map(salaries_k, print_element); cout << endl; cout << YEARS << " years at " << 100 * INTEREST_RATE << "%:\t"; vector compounded_money = map(salaries_k, compound_interest); map(compounded_money, print_element); cout << endl; cout << "Millionaire:\t"; vector years = map(salaries_k, years_until_millionaire); map(years, print_element); cout << endl; return 0; }

Language	Title	Created	Username
LanguageCpp	TitlePointers	Created8 years ago	Usernamerose0x4
LanguageCpp	TitleFunction Pointers	Created8 years ago	Usernamerose0x4

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