我在用c++练习写一题计算复利式，请帮忙看看出了什麼问题?指教一下我应如何写会比较好?

Question

#include <cstdlib>
#include <iostream>
#includle <iomanip.h>

using namespace std;

int main(int argc, char *argv[])
{

double totalamount;
double interestrate;
double principalamount;
double years;
double interestgain;
double fv;

cout << " Please enter the principal : ";
cin >> principalamount;

cout << " Please enter the interest : " ;
cin >> interestrate;

cout << " Please enter the year : ";
cin >> years;

for (int i = 0 ; i<years;i++)
{
fv = principalamount*(1 + interestrate/100)*years/ 365;
}

fv = interestgain;

interestgain = fv - principalamount;

cout << interestgain << endl;
cout << " The interest gain is : " << interestgain << setprecision(3)<< endl;

cout << " Amount in savings : " << fv << endl;

Answer 1

第一、最后少个大括号；
第二、#includle <iomanip.h> include多了个l；
第三、fv = interestgain; 这句中interestgain没有初值；你for循环算出一个fv，马上被覆盖掉那for循环还有什么意义？
第四、cout << " The interest gain is : " << interestgain << setprecision(3)<< endl; 这句改成cout << " The interest gain is : " << setprecision(3) << interestgain << endl;
第五、头文件 #includle <iomanip.h>把.h去掉，我的编译器还要加上#include <stdafx.h>，不知道你要不要加。

Answer 2

interestgain=principalamount;
for (int i=1;i<years;i++)
{
fv=principalamount*(1+interestrate/100)*i;
principalamount=fv;
}
fv=principalamount;
你的题目没有注释，看不太懂；for循环给你改了一下；不知道是不是符合你的意思；仅供参考