c-resources/CPlusPlus20ForProgrammers-m.../examples/ch04/fig04_12.cpp

41 lines
1.8 KiB
C++

// fig04_12.cpp
// Compound-interest example with C++20 text formatting.
#include <iostream>
#include <cmath> // for pow function
#include "fmt/format.h" // in C++20, this will be #include <format>
using namespace std;
using namespace fmt; // not needed in C++20
int main() {
double principal{1000.00}; // initial amount before interest
double rate{0.05}; // interest rate
cout << format("Initial principal: {:>7.2f}\n", principal)
<< format(" Interest rate: {:>7.2f}\n", rate);
// display headers
cout << format("\n{}{:>20}\n", "Year", "Amount on deposit");
// calculate amount on deposit for each of ten years
for (int year{1}; year <= 10; ++year) {
double amount{principal * pow(1.0 + rate, year)};
cout << format("{:>4d}{:>20.2f}\n", year, amount);
}
}
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