在表達式中使用pow函數

Question

#include <iostream> 
#include <string> 
#include <iomanip> 
#include <cmath> 

// Defining Variable 

using namespace std; 

const int MONTHS_IN_YEAR = 12; 
const int PURCHASE_PRICE= 123500; 
const int AMOUNT_MORG= 111150; 
const int DOWN_PAYMENT = 12350; 
const float MONTHLY_RATE= 0.542f; 
const float FORMULA_RATE=1.542f; 
float PAYMENT; 
int main() 




{ 

PAYMENT= (float)(MONTHLY_RATE*AMOUNT_MORG)*(pow(1.542,180)); 
cout << PAYMENT; 

cout << fixed << showpoint << setprecision(2); 


system ("cls"); 
cout <<"$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$"; 
cout <<'$'; 
cout << setw(79)<<'$'; 
cout<<'$'; 
cout << setw(79)<<'$'; 
cout << '$'; 
cout << setw(79)<<'$'; 
cout << '$'<<"  " <<"Welcome to the mortgage information calculator 2013" 
<<"      " << '$'; 
cout <<'$'; 
cout << setw(79)<<'$'; 
cout<<'$'; 
cout << setw(79)<<'$'; 
cout <<'$'<< "  "<< " Made exclusively for Dewey,Cheatum and Howe bankers" 
<<"      "<<'$'; 
cout <<'$'; 
cout << setw(79)<<'$'; 
cout<<'$'<<"  "<< "by: Steven Fisher" 
<<"              "<<'$'; 
cout <<'$'; 
cout << setw(79)<<'$'; 
cout<<"$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$"<<endl; 

system ("pause"); 




return 0; 

} 

所以這裏是我的代碼。我是新來的C++語言，我在課堂上被分配了一個項目，我必須計算抵押貸款的每月支付。

我需要使用pow函數並將乘方乘以表達式。下面是我的嘗試：

(float)(MONTHLY_RATE*AMOUNT_MORG)*(pow(1.542,180)) 

，當我運行該程序，我得到的1.#inf答案。

任何幫助，將不勝感激。

Answer 1

1.542 大於7,164,522,793,368,325,816,802,274,738,448,555。這是一個非常大的數字，你確定它適合你的浮點類型嗎？

根據您的意見如下，它看起來像你想使用1.00542。您還有其他幾個信息也是錯誤的（MONTHLY_RATE,FORMULA_RATE）。