如何解决此变量初始化问题？如果我只能弄清楚如何只初始化它们一次......
* Main.cpp : main project file.
/************************** Begin Header **************************/
#include "stdafx.h" //Required by Visual C ++
#include <string> //Required to use strings
#include <iostream> //Required for a bunch of important things
#include <iomanip> //Required for manipulation of text and numbers
using namespace System; // Automatically uses System namespace
using namespace std; // Automatically uses std namespace
#pragma hdrstop // Stops header here
/*************************** End Header ***************************/
//* Begin Function Headers *//
void inputData(); // This will be used to organize class member calls when setting and getting new data.
int getData(); // Will get user data, input in character string, convert to an integer and then perform data validation.
void createReport(int place, int number, string type); // Will organize commands to create the report and display it on the screen.
//* End Function Headers *//
class JarsSold // Begin Class -- JarsSold
{
/* Begin Initialization & Creation of important resources */
private:
static const int MaxArray = 5; // Value for the size of array JARS_SOLD
int JARS_SOLD[MaxArray]; // Creation of array with size of MaxArray
/* End Initialization & Creation of important resources */
public: // Makes underlining elements Public instead of the default Private
JarsSold() // Begin Constructor
{ // Put something in num array
JARS_SOLD[0] = 0; // [1]
JARS_SOLD[1] = 0; // [2]
JARS_SOLD[2] = 0; // [3]
JARS_SOLD[3] = 0; // [4]
JARS_SOLD[4] = 0; // [5]
} // End Constructor
~JarsSold(){}; // Destructor
/* Put all members for JarsSold class below here */
void setNumber(int num, int value) // Set the number of jars sold with number placement in array and value to replace it with
{
JARS_SOLD[num] = value; // Stores value into JARS_SOLD at whatever num is at the time
}; // End setNumber class member
int getNumber(int num) // Get the current number held for jars sold with number placement in array
{
return JARS_SOLD[num]; // Returns whatever is in JARS_SOLD depending on what num is at the time
} // End getNumber class member
/* Put all members for JarsSold class above here */
}; // End Class -- JarsSold
class SalsaTypes // Begin Class -- SalsaTypes
{
/* Begin Initialization & Creation of important resources */
private:
static const int MaxArray = 5; // Value for the size of array JARS_SOLD
string SALSA_TYPES[MaxArray]; // Creation of array with size of MaxArray
/* End Initialization & Creation of important resources */
public: // Makes underlining elements public instead of the default Private
SalsaTypes() // Begin Constructor
{ // Add default strings to str array
SALSA_TYPES[0] = "Mild"; // [1] Stores Mild into SALSA_TYPES at 0 spot
SALSA_TYPES[1] = "Medium"; // [2] Stores Medium into SALSA_TYPES at 1 spot
SALSA_TYPES[2] = "Sweet"; // [3] Stores Sweet into SALSA_TYPES at 2 spot
SALSA_TYPES[3] = "Hot"; // [4] Stores Hot into SALSA_TYPES at 3 spot
SALSA_TYPES[4] = "Zesty"; // [5] Stores Zesty into SALSA_TYPES at 4 spot
} // End Constructor
~SalsaTypes(){}; // Destructor
/* Put all members for SalsaTypes class below here */
void setType(int num, string type) // Set salsa type with number placement in array and string value to replace with
{
SALSA_TYPES[num] = type; // Stores the string type into SALSA_TYPES at whatever num is at the time
}; // End setType class member
string getType(int num) // Get the Salsa Type with number placement in array
{
return SALSA_TYPES[num]; // Returns SALSA_TYPES depending on what is in num at the time
}; // End getType class member
/* Put all members for SalsaTypes class above here */
};// End Class -- SalsaTypes
void main( void ) // Begin Main Program
{
cout << fixed << setprecision(1) << setw(2); // Do a little customization with IoManip, might as well, we just might need it
// Main Program Contents Begin Here //
// Opening Credits for Program
cout << "Welcome to the /Professional Edition\\ of the Chip and Salsa Sale Tool EXPRESS." << endl;
cout << "This handy-dandy tool will make a chip and salsa manufacturer's job much easier!" << endl;
cout << endl << endl << endl;
cout << "Press any key to begin inputing the number of jars sold for these salsa flavors: " << endl << endl;
cout << "-Mild" << endl << "-Medium" << endl<< "-Sweet" << endl << "-Hot" << endl << "-Zesty" << endl << endl << endl;
system("pause"); // Pause here. After this begin data input
cout << endl << endl << endl;
inputData(); // Will deal with data input, validation, and reports
// Main Program Contents End Here //
} //End Main Program
// All Content for Functions Begin Here //
void inputData() // Begin inputData Function
{
// Begin Create Class Obects //
SalsaTypes salsa;
JarsSold jars;
// End Create Class Objects //
// Variable Creation Begin //
// Variable Creation End //
// All Content for Functions Begin Here //
for (int i = 0 ; i < 5 ; i++) // Start For Loop
{
cout << "Input how many Jars were sold for \"" << salsa.getType(i) << "\"" << ": "; // Displays which Salsa we are reffering to
jars.setNumber(i,getData()); // Will use getData() to determine what value to send to the JarsSold class.
createReport(i,jars.getNumber(i),salsa.getType(i)); // Send these numbers to another function so it can make a report later
cout << endl << endl; // Using this as a spacer
}
// All Content for Functions End Here //
}; // End inputData Function
int getData() // Begin getData Function
{
// Variable Creation Begin //
char charData[40]; // Will be used to store user data entry
int numTest; // Will be used for Data Validation methods
// Variable Creation End //
// Main Contents of Function Begin Here //
retry: // Locator for goto command
cin >> charData; // Ask user for input. Will store in character string then convert to an integer for data validation using 'Atoi'
numTest = atoi ( charData ); // Convert charData to integer and store in numTest
if (numTest < 0) { numTest = 0; cout << endl << endl << "You can't enter negative numbers! Try Again." << endl << endl << "Re-enter number: "; goto retry;} // Filter out negative numbers
// Main Contents of Function End Here //
return numTest; // If it makes it this far, it passed all the tests. Send this value back.
}; // End getData Function
void createReport(int place, int number, string type) // Begin createReport Function
{
// Variable Creation Begin //
int const MAX = 5; // Creat array size variable
int lowest; // The integer it will use to store the place of the lowest jar sales in the array
int highest; // The integer it will use to store the place of the highest jar sales in the array
int total; // The integer it will use to store total sales
int numArray[MAX]; // Create array to store jar sales (integers)
string typeArray[MAX]; // Create array to store types of salsa (strings)
// Variable Creation End //
// Main Contents of Function Begin Here //
numArray[place] = number; // Store number into new array
typeArray[place] = type; // Store type into new array
if (place = 4) // If the array is full it means we are done getting data and it is time to make the report.
{ // Begin making report, If statement start
for ( int i = 0 ; i < 5 ; i++ ) // Using a for-loop to find the highest and lowest value in the array
{ // For Loop to find high and low values BEGIN
if ( lowest < numArray[i]) // Keep setting lowest to the lowest value until it finds the lowest one
{ // Start If
lowest = numArray[i]; // Lowest equals whatever is in numArray at i spot
} // End If
if ( highest > numArray[i]) // Keep setting highest to the highest value until it finds the highest one
{ // Start If
highest = numArray[i]; // Highest equals whatever is in numArray at i spot
} // End If
total += numArray[i]; // Will continually add numArray at i spot until it has the total sales
} // For Loop to find high and low values END
// Main Contents of Function End Here //
} // END creatReport Function
// All Content for Functions Ends Here //
我的问题是......我需要将数据从一个函数传递到另一个函数。我以为我可以弄清楚如何创建全局类对象，但我不能。所以我认为我可以绕过将参数传递给另一个函数，然后将它们恢复到自己的数组中然后继续这样做，直到我完全复制了所有数字数组和字符串数组。嗯...是的，确实有效除了createReport（）中的这一部分：
// Variable Creation Begin //
int const MAX = 5; // Create array size variable
int lowest; // The integer it will use to store the place of the lowest jar sales in the array
int highest; // The integer it will use to store the place of the highest jar sales in the array
int total; // The integer it will use to store total sales
int numArray[MAX]; // Create array to store jar sales (integers)
string typeArray[MAX]; // Create array to store types of salsa (strings)
// Variable Creation End //
发生的事情是，我想我太累了以至于我错过了它，每当我调用该函数时它再次重新初始化那些相同的变量。我将变量放入另一个变量，然后重新初始化为默认值。
我尝试使用一个计数器变量，它在初始化后计为1，然后在它为1之后再次初始化。不行，因为变量没有在if语句的范围之外初始化。然后我尝试了一个GOTO语句，它会在它发生一次之后跳过初始化。没有第一个初始化阶段出现问题而没有编译。
我需要弄明白我该如何
我还不擅长编程。但我向你保证，我已经在这件作品上工作了几个小时，几个小时和几个小时，我一直熬夜，不断试错。我为自己感到自豪，因为这段代码对我来说非常先进。我看过谷歌的每一个教程，我很幸运 - 你们是我最后的希望!!对不起伙计们。我知道这是一个愚蠢的问题......
最后一个快速问题。你如何创建全局类对象？例如
MyClass
{
MyClass(){};
~MyClass(){};
}
MyClass MyClassObject;
如何在整个程序中使用MyClassObject？
我可以使用它的唯一方法是每次使用我使用的每个函数创建一个新对象。这意味着我丢失了我班上存储的所有数据？
我已经读过，拥有全局对象并不是一个好主意。我很乐意不必使用它们，但我不知道任何我能理解的替代方案。
非常感谢任何其他批评或提示。我喜欢这些东西我只是没有很多人提问。
答案 0 :(得分：3)
你做得很好！简单的答案是在变量前写静态：
static int const MAX = 5; // Creat array size variable
static int lowest; // The integer it will use to store the place of the lowest jar sales in the array
static int highest; // The integer it will use to store the place of the highest jar sales in the array
static int total; // The integer it will use to store total sales
static int numArray[MAX]; // Create array to store jar sales (integers)
static string typeArray[MAX]; // Create array to store types of salsa (strings
我想我可以给你更好的建议，我会再看一下你的代码。至于全局变量，你在那里使用MyClassObject编写的内容可以正常工作。你会这样使用它：
MyClass {
public:
MyClass(){};
~MyClass(){};
int variable;
};
MyClass MyClassObject;
// in a method you'd do this
void whateverMethod() {
MyClassObject.variable = 5;
std::cout << MyClassObject.variable << std::endl;
}
那种事。有一些风格问题可以修复，但说实话我说先让它先工作然后我们就可以谈论那些。
答案 1 :(得分：2)
1）让它们静止，例如
static string typeArray[MAX];
初始化它们一次，它们将保持不变直到您更改它们。不要试图从两个线程同时使用它们。
2）您可以通过在文件范围内声明它来创建全局对象：
class CFoo;
CFoo s_foo;
class CFoo
{
public:
CFoo();
~CFoo();
}
然后s_foo将成为CFoo的一个实例，它可以在任何地方看到s_foo（这个文件和其他有外部CFoo s_foo的文件;）