哪位高人能给我讲一讲要怎么写 是怎么回事啊

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#include <iostream>
#include <iomanip>
#include <math.h>
using namespace std;

int main()
{
   cout << setiosflags(ios::fixed) << setprecision(2);
   double money, rate, year;
   cin >> money >> rate >> year;
   cout << money * pow((1 + rate), year) - money;
   return 0;
}