c++ primer plus 第五章《编程题5.9.4》

原创于 2015-08-19 15:18:59 发布 · 339 阅读

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本文通过一个简单的C++程序模拟了两个不同本金的投资方案中，一方如何在利息上超越另一方的过程。该程序使用了循环和基本的数学计算来逐年比较两者的利息累积，最终输出在多少年后，本金较少的一方（Cleo）的利息超过了本金较多的一方（Daphne）。

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/*
 After 141 year Cleo's interest over Daphne's.
 Daphne's principle: 14200.
 Cleo's principle: 97205.5.
 */
#include <iostream>

using namespace std;

int main() {

    int countYear = 0;
    const float principle = 100;
    const float DaphneInterestPer = 0.1;
    const float CleoInterestPer = 0.05;

    float DaphnePrinciple = principle;
    float CleoPrinciple = principle;
    float DaphneSum = principle * DaphneInterestPer;
    float CleoSum = principle * CleoInterestPer;

    while (CleoSum <= DaphneSum) {
        if (CleoSum == DaphneSum)
            break;
        DaphnePrinciple += principle;
        CleoPrinciple = principle + CleoSum;
        DaphneSum += DaphnePrinciple * DaphneInterestPer;
        CleoSum += CleoPrinciple * CleoInterestPer;
        countYear++;
    }

    cout << "After " << countYear << " year Cleo's interest over Daphne's.\n";
    cout << "Daphne's principle: " << DaphnePrinciple << ".\n";
    cout << "Cleo's principle: " << CleoPrinciple << ".\n";

    return 0;
}