Hello, I have wrote this little program for dynamic memory allocation with some

Question

Hello, I have wrote this little program for dynamic memory allocation with some help. I turned in my code to my professor and he stated: "Hello,

I have wrote this little program for dynamic memory allocation with some help.

I turned in my code to my professor and he stated:

"Set elementReturned to the number of elements in the dynamically allocated array, and return the dynamically allocated array to the caller."

I don't understand what he means Please Help!

Code:

#include<iostream>

#include<string>

using namespace std;

// function declaration

void show( const unsigned a[], unsigned items );

unsigned * evenValues( unsigned * elementsReturned,

const unsigned a[], unsigned elementsPassed );

bool die( const string & msg );

int main(){

unsigned a[] = {1,2,3,4,5,4,3,2,1};

unsigned elementsReturned;

unsigned elementsPassed;

elementsPassed = sizeof(a)/sizeof(*a);

elementsReturned = 0;

unsigned * ptr = evenValues(&elementsReturned,a,elementsPassed);

show( ptr, elementsReturned );

delete[] ptr;

} //main

unsigned * evenValues( unsigned * elementsReturned,

const unsigned a[], unsigned elementsPassed ){

unsigned * ptr = NULL;

for ( unsigned i = 0 ; i < elementsPassed ;i++){

if (a[i]%2 == 0 )

(*elementsReturned)++;

}

try{

ptr = new unsigned[*elementsReturned];

}catch( bad_alloc & ){

die( "allocation error" );

}

for (unsigned i = 0 , j = 0; i < elementsPassed ;i++){

if (a[i]%2 == 0 )

ptr[j++] = a[i];

}

return ptr;

} // evenValues

void show( const unsigned a[], unsigned items ){

cout<<"["<<items<<"]: ";

for ( unsigned i = 0 ; i < items ; i++ ){

cout<<a[i];

i == items -1 ? cout<< " " : cout<<", ";

}

}

bool die( const string & msg ){

cerr <<"Fatal error " <<msg <<endl;

exit( EXIT_FAILURE );

}

Explanation / Answer

#include<iostream>
#include<string>
using namespace std;

// function declaration

void show( const unsigned a[], unsigned items );
unsigned * evenValues( unsigned * elementsReturned,const unsigned a[], unsigned elementsPassed );
bool die( const string & msg );

int main(){

unsigned a[] = {1,2,3,4,5,4,3,2,1};

unsigned elementsReturned;

unsigned elementsPassed;

elementsPassed = sizeof(a)/sizeof(*a);

elementsReturned = 0;

unsigned * ptr = evenValues(&elementsReturned,a,elementsPassed);

show( ptr, elementsReturned );

delete[] ptr;

} //main


unsigned * evenValues( unsigned * elementsReturned,const unsigned a[], unsigned elementsPassed ){

unsigned * ptr = NULL;

for ( unsigned i = 0 ; i < elementsPassed ;i++){

if (a[i]%2 == 0 )

( *elementsReturned)++;

try{

ptr = new unsigned[*elementsReturned];

}

catch( bad_alloc & ){

die( "allocation error" );

}


for (unsigned i = 0 , j = 0; i < elementsPassed ;i++)

{

if (a[i]%2 == 0 )

ptr[j++] = a[i];

}

return ptr;

} // evenValues


void show( const unsigned a[], unsigned items ){

cout<<"[";
for ( unsigned i = 0 ; i < items ; i++ ){

cout<<a[i] ;
i == items -1 ? cout<< " " : cout<<", ";

}

}


bool die( const string & msg ){

cerr <<"Fatal error " <
exit( EXIT_FAILURE );

}

I think u have done the same thing

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