程序不会降低最低分，并计算没有它的平均分

Question

代码运行良好，除非它不降低最低分并计算它。

输出例：

多少测试成绩你想进入？
进入测试得分期望：
1分：58
评分2：96
3分：78
测试分数平均具有最低下降是：116.00

问题： 正如你可以在输出示例中看到，这是不正确的。它必须显示不包括最低的平均值。您可以查看我的代码并让我知道我哪里出错了吗？我也有几个人也看过它，他们无法看到我的代码中有任何错误。下面是我的代码：

代码：

#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

你在这个码连续3个显著错误：

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]; 
} 

的错误是在这里：

int lowest = score[count]; 

它需要是这样的：

int lowest = score[0]; 

接下来，环内：

lowest = score[0]; // ERROR 

应该是：

lowest = score[count]; 

所以，你的循环应该是这样的：

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

最后，总数的计算也是错误的。通过分数的数量少一中减去所述最低得分后总所有得分的计算，然后分：

//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 
} 

应该是：

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

Answer 2

的代码从total减去lowest每次通过循环。将该线移到循环外部，效果会更好。

编辑：和，作为@WhozCraig指出，lowest没有得到正确的初始值。

Answer 3

在这一行：

int lowest = score[count]; 

你怎么想count是什么？

Answer 4

当你这样做：

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

您count变量等于numTest，因为你刚刚离开前一循环。

你应该写

//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 
}