C++每日一题（基础）7、8

7.假设你每月向银行账户存100美元，年利率为5%，
那么每月利率是0.05/12=0.00417

第一个月之后：账户上的值变成了100*(1+0.00417)=100.417

第二个月之后：账户上的值变成了(100+100.417)*(1+0.00417)=201.252

第三个月之后：账户上的值变成了(100+201.252)*(1+0.00417)=302.507以此类推，编写显示n个月后的账户上的钱数.

#include
using namespace std;
int main()
{
	double m_c=0;
	float ir=0.00417;
	int n;
	cout << "请输入第几个月：";
	cin >> n;
	while (n)
	{
		m_c = (100.0 + m_c) * (1.0 + ir);
		n--;
	}
	cout << m_c;
}

8.编写一个随机产生1和12之间的整数的程序，并且根据数字显示相应的月份单词

#include
#include
#include
using namespace std;
int main()
{
	int m_rand;
	srand(time(NULL));
	string mouth[] = { "January","February","March","April","May","June","July","August","September","October","November","December" };
	m_rand = rand() % 12;
	cout << "产生的随机月份为：";
	cout << mouth[m_rand - 1] << endl;;
	system("pause");
}