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add collections

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add pointers
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david
2025-09-16 18:10:24 +02:00
parent 27a9acdee6
commit d8f6014fab
12 changed files with 634 additions and 1 deletions
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CPlusPlus/Pointers/Pointers.vcxproj
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CPlusPlus/Pointers/Pointers.vcxproj.filters
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CPlusPlus/Pointers/functions.cpp
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#include "functions.h"
void changeInteger(int n)
{
n *= 2;
}
int changeIntegerPerReturn(int n)
{
return n * 2;
}
bool changeIntegerPerPointer(int* pN)
{
if (pN == nullptr) return false;
*pN *= 2;
return true;
}
bool changeIntegerPerReference(int& n)
{
n *= 2;
return true;
}
CPlusPlus/Pointers/functions.h
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#pragma once
void changeInteger(int n);
int changeIntegerPerReturn(int n);
bool changeIntegerPerPointer(int* pN);
bool changeIntegerPerReference(int& n);
CPlusPlus/Pointers/main.cpp
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#include <iostream>
#include "functions.h"
using namespace std;
int main()
{
// general
int* pNumber = nullptr; // pointer definition, always initialize a pointer (at least with nullptr)
pNumber = new int(0); // creates a new integer value on the heap
cout << "size of pointer: " << sizeof(pNumber) << endl;
cout << "size of pointer data: " << sizeof(*pNumber) << endl;
*pNumber = 789;
//pNumber = new int(0); // BAD BAD - memory leak, because we override an existin g pointer address with a new one without saving or deleting the old one
// here are 100s lines of code
if (pNumber != nullptr)
{
delete pNumber;
pNumber = nullptr;
}
// pointer as references outside local scope
int number = 10;
changeInteger(number);
number = changeIntegerPerReturn(number);
changeIntegerPerPointer(&number);
changeIntegerPerPointer(pNumber);
changeIntegerPerReference(number);
return 0;
}