[Solved] Merge Sort Algorithm merging of two a arrays in third on a condition [closed]

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#include <iostream>
#include <cstdlib>
#include <conio.h>
using namespace std;

int main()
{

int sizeofarray=0,i=0 ,j=0, num=0, answers[]={};
cout<<"enter the size of array"<<endl;
cin>>sizeofarray;//take size of array from user
int array1[sizeofarray];
int array2[sizeofarray];
cout<<"please enter a sorted array member of Array1"<<endl;
//input of array element 
for ( i=0 ; i<=sizeofarray; i++)
{
    cin>>array1[i];
}
system("CLS");
cout<<"please enter a sorted array member of Array2"<<endl;
for (j=0 ; j<=sizeofarray; j++)
{
    cin>>array2[j];
}
system("CLS");
//comparing the array element and storing the similar items to another array
while(array1[i]!=NULL && array2[j]!=NULL){
    if(array1[i]==array2[j]){
    answer[num++]=array1[i];
    i++;
    j++;
    }
    else if(array1[i]<array2[j])
{
i++;
}else{
j++;
    }
i++;
j++;
}
cout<<"The number of common elements"<<num<<endl;
cout<<"These are the common numbers: ";
for (int k=0;k<num;k++){
    cout<<answer[k]<<" ";
}
getch();
return 0;

}

solved Merge Sort Algorithm merging of two a arrays in third on a condition [closed]