Given main() and pointer_funcs.h, write the four functions in the TODO outlined below. #include using namespace std;int* passByValue(int val);int* passByReference(int* val);void changeByValue(int val);void changeByReference(int* val);#include #include "pointer_funcs.h"using namespace std;//TODO: passByValue takes an int as parameter//calls cout with "Value in passByValue://Then returns a pointer to the parameterand the value//TODO: passByReference takes an int pointer as parameter//calls cout with "Value in passByReference: " and the value//Then returns the pointer itself//TODO: changeByValue takes an int as parameter//Doubles the value, calls cout with://"Doubled in ChangeByValue: " and the value//then returns nothing//TODO: changeByReference takes an int pointer as parameter//Doubles the value pointed to, calls cout with://"Doubled in ChangeByReference: " and the value//then returns nothing #include #include "pointer_funcs.h"using namespace std;int main(){}int* pointer = new int;cout << boolalpha;cin >> *pointer;cout << "Value pointed to: << *pointer << endl;int* pbv passByValue(*pointer);IIint* pbrpassByReference (pointer);cout << "Memory values are equivalent in passByValue? << (pointercout << "Memory values are equivalent in passByReference? " << (pointer=changeByValue(*pointer);cout << "Value of the pointer var: << *pointer << endl;changeByReference (pointer);cout << "Value of the pointer var: " << *pointer << endl;==pbv) << endl;==pbr) << endl;

The Solution for the given problem is as follows where the TODO for the following four functions…

//TODO: passByValue takes an int as parameter //calls cout with "Value in passByValue: //Then returns a pointer to the parameter and the value //TODO: passByReference takes an int pointer as parameter //calls cout with "Value in passByReference: and the value //Then returns the pointer itself 11

//TODO: passByValue takes an int as parameter //calls cout with "Value in passByValue: //Then returns a pointer to the parameter and the value //TODO: passByReference takes an int pointer as parameter //calls cout with "Value in passByReference: and the value //Then returns the pointer itself 11

Database System Concepts

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Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

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Concept explainers

Concept of Pointer Parameter

Pointers are the special variable that stores the variable address, instead of storing the variable value. Pointer is a powerful feature of a programming language. A pointer is mostly used to save memory space and improve execution time.

Question

Given main() and pointer_funcs.h, write the four functions in the TODO outlined below.

#include <iostream>
using namespace std;
int* passByValue(int val);
int* passByReference(int* val);
void changeByValue(int val);
void changeByReference(int* val);
#include <iostream>
#include "pointer_funcs.h"
using namespace std;
//TODO: passByValue takes an int as parameter
//calls cout with "Value in passByValue:
//Then returns a pointer to the parameter
and the value
//TODO: passByReference takes an int pointer as parameter
//calls cout with "Value in passByReference: " and the value
//Then returns the pointer itself
//TODO: changeByValue takes an int as parameter
//Doubles the value, calls cout with:
//"Doubled in ChangeByValue: " and the value
//then returns nothing
//TODO: changeByReference takes an int pointer as parameter
//Doubles the value pointed to, calls cout with:
//"Doubled in ChangeByReference: " and the value
//then returns nothing

#include <iostream>
#include "pointer_funcs.h"
using namespace std;
int main()
{
}
int* pointer = new int;
cout << boolalpha;
cin >> *pointer;
cout << "Value pointed to: << *pointer << endl;
int* pbv passByValue(*pointer);
II
int* pbr
passByReference (pointer);
cout << "Memory values are equivalent in passByValue? << (pointer
cout << "Memory values are equivalent in passByReference? " << (pointer
=
changeByValue(*pointer);
cout << "Value of the pointer var: << *pointer << endl;
changeByReference (pointer);
cout << "Value of the pointer var: " << *pointer << endl;
==
pbv) << endl;
==
pbr) << endl;

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