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我正在創建一個模擬水庫填充的程序。除了我想要做的最後一件事情之外，這個過程一切正常，這個過程是獲取填滿水庫所需的最大，最小和平均年數。我想這樣做，而不使用數組。我認爲我很接近，但我必須錯過簡單的東西。原諒我，我只是在學習C++。在C++中查找序列的最小值/最大值/平均值
#include <iostream>
#include <cstdlib>
#include <cmath>
#include <string>
#include <ctime>
using namespace std;
int main()
{
string operation;
do{
cout << "Using the letters 's', or 'q', please indicate if you would like to run a simulation, or quit the program: " << endl;
cin >> operation;
} while (operation != "s" && operation != "q");
string reservoir_name; // Creating variables for reservoir
double reservoir_capacity;
double outflow;
double inflow_min;
double inflow_max;
if (operation == "q")
{
cout << endl;
cout << "This was a triumph . . ." << endl;
cout << "I'm making a note here: huge success!" << endl;
system ("pause");
return 0;
}
while (operation == "s")
{
string reservoir_name; // Creating variables
double reservoir_capacity;
double inflow_min = 0;
double inflow_max = 0;
double inflow_average = inflow_min + inflow_max;
double inflow_difference = inflow_max - inflow_min;
double inflow_threshold = .9 * inflow_average/2; // Math for acceptable flow threshold.
cout << "What is the name of the reservoir?" << endl;
cin.ignore();
getline (cin,reservoir_name); // Grab whole string for reservoir name.
cout << "What is the capacity of the reservoir in MAF (Millions of Acre Feet)?" << endl;
cin >> reservoir_capacity;
cout << "What is the minimum inflow?" << endl;
cin >> inflow_min;
cout << "What is the maximum inflow?" << endl;
cin >> inflow_max;
cout << "What is the required outflow?" << endl;
cin >> outflow;
cout << endl;
inflow_average = inflow_min + inflow_max;
inflow_threshold = .9 * inflow_average/2; // Calculate threshold for too much outflow.
cin.ignore();
if (outflow > inflow_threshold) // Check for unacceptable outflow levels.
{
cout << "Warning! The outflow is over 90% of the average inflow. Simulation aborted. Returning to main menu." << endl << endl;
}
else
{
const int number_simulations = 10;
cout << endl;
cout << "Reservoir name: " << reservoir_name << endl;
cout << "Capacity of reservoir in MAF: " << reservoir_capacity << endl;
cout << "Maximum inflow in MAF: " << inflow_max << endl;
cout << "Minimum inflow in MAF: " << inflow_min << endl;
cout << "Required outflow in MAF: " << outflow << endl << endl;
cout << "Running simulation . . ." << endl << endl;
srand (time(0));
const int sentinel = -1;
int minimum = sentinel;
int maximum = sentinel;
int years_total;
for (int i = 1; i <= number_simulations; i++) // Loop should run the filling simulation 10 times.
{
int years = 0;
double fill_level = 0;
for (years; fill_level < reservoir_capacity; years++) // Loop should simulate filling reservoir using random inflow values between inflow_min and inflow_max.
{
double r = rand() * 1.0/RAND_MAX;
double x = inflow_min + (inflow_max - inflow_min) * r;// SHOULD be between minimum inflow and maximum inflow.
// cout << "Random Number x :" << x << endl; WAS USED TO CHECK IF RANDOM NUMBER WAS CHANGING
fill_level = fill_level + x - outflow;
if (fill_level < 0)
{
fill_level = 0; // Prevent fill level from going negative.
}
//cout << "Fill level is " << fill_level << endl; TO CHECK THE CHANGE IN FILL LEVEL PER ITERATION
if (minimum == sentinel || years < minimum) // Trying to set up the method for retrieving minimum value here. Currently returning as 0.
{
minimum = years;
}
if (maximum == sentinel || years > maximum) // Trying to set up the method for retrieving maximum value here. Currently returning as 1 less than the actual maximum.
{
maximum = years;
}
} // Simulate the change of water level.
cout << "Simulation " << i << ": The reservoir took " << years << " years to fill." << endl;
}
cout << "The minimum number of years needed to fill: " << minimum << endl;
cout << "The maximum number of years needed to fill: " << maximum << endl;
cout << "The average number of years needed to fill: " << years_total/10 << endl; // Take the running total of years over 10 simulations and divide by 10. Currently returning as 0.
}
cout << endl;
cout << "What would you like to do now?" << endl << endl; // Saving for later. The menu re-prompt message and code.
cout << "Using the letters 's', or 'q', please indicate if you would like to run a simulation or quit the program: " << endl;
cin >> operation;
if (operation == "q")
{
cout << endl;
cout << "This was a triumph . . ." << endl;
cout << "I'm making a note here: huge success!" << endl;
system ("pause");
return 0;
}
}
system ("pause");
return 0;
}
您目前的成果是？你期待什麼？要進行測試，您應該在知道結果而非隨機值的地方使用靜態值。 –
你的問題是什麼？設計算法需要幫助嗎？你想調試幫助嗎？什麼是錯誤？如果逐行執行代碼會發生什麼？你有沒有試過把程序減少到最小的程序，但仍然顯示出問題？ –