c++ primer plus 第五章《编程题5.9.4》

/* 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;}