Question

求c++大神帮我看看编的程序哪错了....

#include <iostream>
using namespace std;

int main()
{
int annualInterestRate;
cout<<"Enter a annualInterestRate :" ;
cin>>annualInterestRate;
const int deposit = 100;

double monthlyInterestRate = annualInterestRate / 1200;
double FirstMonth = deposit * (1 + monthlyInterestRate );
double SecondMonth = (deposit + FirstMonth) * (1 + monthlyInterestRate);
double ThirdMonth = (deposit + SecondMonth) * (1 + monthlyInterestRate);
double FourMonth = (deposit + ThirdMonth) * (1 + monthlyInterestRate);
double FifthMonth = (deposit + FourMonth) * (1 + monthlyInterestRate);
double SixthMonth = (deposit + FifthMonth) * (1 + monthlyInterestRate);

cout <<"The FirstMonth is : "<<FirstMonth
<<"\n The SecondMonth is : "<<SecondMonth
<<"\n The ThirdMonth is : "<<ThirdMonth
<<"\n The FourthMonth is : "<<FourMonth
<<"\n The FifthMonth is : "<<FifthMonth
<<"\n The SixMonth is : "<<SixthMonth<<endl;

return 0 ;
}

程序中想表达的意思，是下一个月和上个月累加，可是输出结果却是
100

200
300
400
500
600.。。

求大神给我，书上没写的特别清楚，自学的孩子，求照顾哦(*^__^*)

Answer 1

你在程序中加上上个月的就可以了啊

Answer 2

double monthlyInterestRate = annualInterestRate / 1200; 问题在这行

/1200.0

追问

谢谢哈~真的可以了，我想问问为什么呢？~

追答

整形 / 整形 得整形
3 / 5 得 0 而不是0.6