在开始之前，我会指出我对C ++和一般编程非常陌生，因此，如果我做不正确的事情或以奇怪的方式编写代码，那是因为到目前为止我只学到了很多东西。
无论如何，我被分配了一个程序，首先要写一个程序
- 从用户选择的文件中读取整数
- 输出所有大于或等于零的数字的和与平均值，
- 输出所有小于零的数字的和与平均值
- 输出所有数字的总和和平均值，无论是正数，负数还是零。
- 然后最后询问用户是否要选择另一个文件再次运行
唯一要注意的是，我假设我必须在代码内使用动态数组，以便允许文件容纳任意数量的整数。
到目前为止，除了动态数组的实现之外，我已经拥有所有东西。该代码目前被编程为仅接受10个整数（因为代码中尚无数组）。
这是我的代码：
#include <iostream>
#include <fstream>
#include <iomanip>
using namespace std;
int main() {
//Variables
string inFile;
int numbers,i = 0;
double avg,neg_avg,total_sum,total_avg,sum = 0,neg_sum = 0;;
double count = 0,neg_count = 0,pos_count = 0;
char answer;
do
{
//Input Question
cout << "Enter the file name.\n";
cin >> inFile; // Input from User
ifstream fin; // Open File
fin.open(inFile);
if (fin.fail()) // Check to see if file opens properly
{
cout << "An error occurred while attempting to open the file.\n";
exit(1);
}
while (count < 10)
{
fin >> numbers;
if (numbers >= i)
{
sum += numbers;
count += 1;
pos_count += 1;
}
if (numbers < i)
{
neg_sum = neg_sum + numbers;
count = count + 1;
neg_count = neg_count + 1;
}
}
//Calculations
avg = sum / pos_count;
neg_avg = neg_sum / neg_count;
total_sum = sum + neg_sum;
total_avg = total_sum / 10.0;
//OUTPUT
cout << "The sum of all positive numbers is: " << sum << endl;
cout << "The average of all positive numbers is: " << setprecision(3) << avg << endl;
cout << "The sum of all negative numbers is: " << neg_sum << endl;
cout << "The average of all negative numbers is: " << setprecision(3) << neg_avg << endl;
cout << "The sum of all numbers is: " << total_sum << endl;
cout << "The average of all numbers is: " << setprecision(3) << total_avg << endl;
cout << "-------------------------------------------------" << endl;
cout << "Want us to read another file?\n";
cout << "Enter 'Y' or 'y' for yes,any other character for no." << endl;
cin >> answer;
} while ((answer == 'y') || (answer == 'Y'));
return 0;
}
任何帮助将不胜感激！ 预先感谢
更新：
我已经走了这么远，但是当我编译时，程序会连续运行。不确定我做错了什么。
#include <iostream>
#include <fstream>
#include <iomanip>
using namespace std;
int main() {
//Variables
string file;
int i = 0;
double avg,neg_sum = 0;;
double neg_count = 0,pos_count = 0,totcount = 0;
char answer;
//Input Question
do
{
cout << "Enter the file name.\n";
cin >> file; // Input from User
ifstream fin; // Open File
fin.open(file);
if (fin.fail()) // Check to see if file opens properly
{
cout << "An error occurred while attempting to open the file.\n";
exit(1);
}
while (!fin.eof())
{
int numbers;
fin >> numbers;
int *dynamicArray;
dynamicArray = new int[numbers];
if (numbers >= i)
{
sum += numbers;
pos_count += 1;
totcount += 1;
}
if (numbers < i)
{
neg_sum = neg_sum + numbers;
neg_count = neg_count + 1;
totcount += 1;
}
//Calculations
avg = sum / pos_count;
neg_avg = neg_sum / neg_count;
total_sum = sum + neg_sum;
total_avg = total_sum / totcount;
//OUTPUT
cout << "The sum of all positive numbers is: " << sum << endl;
cout << "The average of all positive numbers is: " << setprecision(3) << avg << endl;
cout << "The sum of all negative numbers is: " << neg_sum << endl;
cout << "The average of all negative numbers is: " << setprecision(3) << neg_avg << endl;
cout << "The sum of all numbers is: " << total_sum << endl;
cout << "The average of all numbers is: " << setprecision(3) << total_avg << endl;
cout << "-------------------------------------------------" << endl;
delete [] dynamicArray;
}
fin.close();
cout << "Want us to read another file?\n";
cout << "Enter 'Y' or 'y' for yes,any other character for no." << endl;
cin >> answer;
} while ((answer == 'y') || (answer == 'Y'));
return 0;
}
更新：
#include <iostream>
#include <fstream>
#include <iomanip>
#include <vector>
using namespace std;
int main() {
//Variables
string file;
int i = 0,value = 0,e = 0;
double avg,totcount = 0;
char answer;
//Input Question
do
{
cout << "Enter the file name.\n";
cin >> file; // Input from User
ifstream fin; // Open File
fin.open(file);
if (fin.fail()) // Check to see if file opens properly
{
cout << "An error occurred while attempting to open the file.\n";
exit(1);
}
// <---------- This works to get the size of the file
int elements;
vector<int> eCount;
while (fin >> elements)
{
eCount.push_back(elements);
}
int size = static_cast<int> (eCount.size());
cout << "size = " << size << endl;// <-----------Test to see if working
//From this point,size of the file is held in the variable,'size'.
int array_size = size;
int* p;
p = new int[array_size];
int location = 0;
while (!fin.eof())
{
fin >> p[location];
location++;
}
cout << "P[12] is equal to " << p[12] << endl;// <----Test to see if array is initialized
while (fin >> p[location])
{
if (p[e] >= i)
{
sum = sum + p[location];
pos_count = pos_count + 1;
totcount = totcount + 1;
}
else
{
neg_sum = neg_sum + p[location];
neg_count = neg_count + 1;
totcount = totcount + 1;
}
location++;
}
//Calculations
avg = sum / pos_count;
neg_avg = neg_sum / neg_count;
total_sum = sum + neg_sum;
total_avg = total_sum / totcount;
fin.close();
//OUTPUT
cout << "The sum of all positive numbers is: " << sum << endl;
cout << "The average of all positive numbers is: " << setprecision(3) << avg << endl;
cout << "The sum of all negative numbers is: " << neg_sum << endl;
cout << "The average of all negative numbers is: " << setprecision(3) << neg_avg << endl;
cout << "The sum of all numbers is: " << total_sum << endl;
cout << "The average of all numbers is: " << setprecision(3) << total_avg << endl;
cout << "-------------------------------------------------" << endl;
cout << "Want us to read another file?\n";
cout << "Enter 'Y' or 'y' for yes,any other character for no." << endl;
cin >> answer;
} while ((answer == 'y') || (answer == 'Y'));
return 0;
}
感谢所有参与的人。我希望我不必使用动态数组，但是不幸的是，如果不实现动态数组，我将不会收到。我更新了代码，但似乎无法正常运行数组，因为它似乎无法正确加载文件中的输入。任何帮助！