爲什麼在這個程序中所有情況下都會得到0％的結果？

Question

我已經在Code :: Blocks上創建了這個測試分數程序，根據最大可達點數和他們在測試中達到的分數計算學生測試的百分比，但是我得到的所有情況都是0％結果，我不知道爲什麼。

有人可以幫我解釋一下嗎？

#include <cstdio> 
#include <cstdlib> 
#include <iostream> 

using namespace std; 

int main(int nNumberofArgs, char* pszArgs[]) 

{ 
    //enter the maximum reachable score 
    int maxscore; 
    cout << "Enter the highest possible score: "; 
    cin >> maxscore; 

    //enter the reached score 
    int score; 
    cout << "Enter your score: "; 
    cin >> score; 

    //calculate percentage 
    //what's wrong here with the percentage calculation? 
    int percentage; 
    percentage = (score/maxscore)*100 ; 

    //output the results (followed by a NewLine) 
    cout << "Your result is: "; 
    cout << percentage <<"%"<< endl; 

    //wait until user is ready before terminating the program to allow the user 
    //to see the program results 
    cout << "Pres Enter to continue..."<<endl; 
    cin.ignore(10, '\n'); 
    cin.get(); 
    return 0; 
} 

Answer 1

您的問題是使用整數百分比。使用浮點數爲小數位數支持。這裏是一個浮動的代碼示例：

#include <cstdio> 
#include <cstdlib> 
#include <iostream> 

using namespace std; 

int main(int nNumberofArgs, char* pszArgs[]) 

{ 
    //enter the maximum reachable score 
    int maxscore; 
    cout << "Enter the highest possible score: "; 
    cin >> maxscore; 

    //enter the reached score 
    int score; 
    cout << "Enter your score: "; 
    cin >> score; 

    //calculate percentage 
    //what's wrong here with the percentage calculation? 
    float percentage; 
    percentage = (score/maxscore)*100 ; 

    //output the results (followed by a NewLine) 
    cout << "Your result is: "; 
    cout << (int) (percentage+0.5) <<"%"<< endl; // fast the Float to int for Zero decimal and add 0.5 befördert fast for rounding. 

    //wait until user is ready before terminating the program to allow the user 
    //to see the program results 
    cout << "Pres Enter to continue..."<<endl; 
    cin.ignore(10, '\n'); 
    cin.get(); 
    return 0; 
} 

Answer 2

你應該改變：

percentage = (score/maxscore)*100 ; 

到

percentage = (score*100)/maxscore ; 

因爲score/maxscore是threated爲整數，所以「地板（）版「爲0，當乘以100時，它只能是100的倍數。