程序不會降低最低分，並計算沒有它的平均分

Question

代碼運行良好，除非它不降低最低分並計算它。

輸出例：

多少測試成績你想進入？
進入測試得分期望：
1分：58
評分2：96
3分：78
測試分數平均具有最低下降是：116.00

問題： 正如你可以在輸出示例中看到，這是不正確的。它必須顯示不包括最低的平均值。您可以查看我的代碼並讓我知道我哪裏出錯了嗎？我也有幾個人也看過它，他們無法看到我的代碼中有任何錯誤。下面是我的代碼：

代碼：

#include <iostream> 
#include <iomanip> 

using namespace std; 


int main() 
{ 
    //To dynamically allocate an array, Accumulator, to hold the average scores. 
    double *score;  
    double total = 0; 
    double average; 


    //int for counter, to hold the number of test scores. 
    int count; 
    int numTest; 


    // To obtain the number of test scores the user would like to enter. 
    cout << "How many test scores would you like to enter? " << endl; 
    cin >> numTest; 


    //Dynamically allocates an array large enough to hold the amount of test scores to enter. 
    score = new double[numTest]; 


    //Get the test scores. 
    cout << "Enter the test score desired. " << endl; 
    for (count = 0; count < numTest; count++) 
    { 
     cout << "Score " << (count + 1) << ": "; 
     cin >> score[count]; 
    } 

    //Find lowest score. 
    int lowest = score[count]; 
    for (count = 1; count < numTest; count++) 
    { 
     if (score[count] < lowest) 
      lowest = score[0]; 
    } 


    //Calculate the total test scores. 
    for (count = 0; count < numTest; count++) 
    { 
     total += score[count]; 
     total -= lowest; 
    } 

    //Calculate the test scores average minus the lowest score. 
    average = total/(numTest - 1); 

    //Display the results 
    cout << fixed << showpoint << setprecision(2); 
    cout << "Test Scores Average with the lowest dropped is: " << average << endl; 

    //Free dynamically allocated memory 
    delete [] score; 
    score = 0; // Makes score point to null. 

    system("pause"); 
    return 0; 
} 

Answer 1

你在這個碼連續3個顯著錯誤：

首先，lowest初始值：

//Find lowest score. 
int lowest = score[count]; // ERROR 
for (count = 1; count < numTest; count++) 
{ 
    if (score[count] < lowest) 
     lowest = score[0]; 
} 

的錯誤是在這裏：

int lowest = score[count]; 

它需要是這樣的：

int lowest = score[0]; 

接下來，環內：

lowest = score[0]; // ERROR 

應該是：

lowest = score[count]; 

所以，你的循環應該是這樣的：

//Find lowest score. 
int lowest = score[0]; 
for (count = 1; count < numTest; count++) 
{ 
    if (score[count] < lowest) 
     lowest = score[count]; 
} 

最後，總數的計算也是錯誤的。通過分數的數量少一中減去所述最低得分後總所有得分的計算，然後分：

//Calculate the total test scores. 
for (count = 0; count < numTest; count++) 
{ 
    total += score[count]; 
    total -= lowest; // ERROR: should not be here. should be AFTER the loop 
} 

應該是：

for (count = 0; count < numTest; count++) 
    total += score[count]; 
total -= lowest; // note: NOT in the loop 

Answer 2

的代碼從total減去lowest每次通過循環。將該線移到循環外部，效果會更好。

編輯：和，作爲@WhozCraig指出，lowest沒有得到正確的初始值。

Answer 3

在這一行：

int lowest = score[count]; 

你怎麼想count是什麼？

Answer 4

當你這樣做：

//Find lowest score. 
int lowest = score[count]; 

您count變量等於numTest，因爲你剛剛離開前一循環。

你應該寫

//Find lowest score. 
int lowest = score[0]; // Error here 
for (count = 1; count < numTest; count++) 
{ 
    if (score[count] < lowest) 
     lowest = score[count]; // Error here too 
}