Arrays and functions

[Ramsin]

Hi, read the following code,

#include "IntegerArray.h"
using namespace std;

int main() {
	int size, n;
	
	cout << "Size of a single array: ";
	while(true) {
		cin >> size;
		cin.ignore();
		if(size >= 1 && size <= 100) break;
	}
	
	int * a = new int[size];
	int * new_a = new int[size];
	int * b = new int[size];
	int * new_b = new int[size];
	
	cout << "(to input): "; 
	cin >> n;
	cin.ignore();
	new_a = input_array(a, n);
	
	cout << "(to copy): "; 
	cin >> n;
	cin.ignore();
	new_b = copy_array(b, new_a, n);
	
	cout << "(to display): ";
	cin >> n;
	cin.ignore();
	display_array(new_b, n);
	
	delete [] a;
	delete [] new_a;
	delete [] b;
	delete [] new_b;
}

#include <iostream>
using namespace std;

int * const input_array(int * const a, int n) {
	int p;
	for(int i=0; i<n; ) {
		cin >> p;
		cin.ignore();
		a[n] = p;
		i++;
	}
	
	return a;
}

int * const copy_array(int * const a, int * const b, int n) {
	for(int i=0; i<n; ) {
		a[n] = b[n];
		i++;
	}
	
	return a;
}

void display_array(int * const a, int n) {
	for(int i=0; i<n; ) {
		cout << "[" << i << "] " << a[i] << endl;
		i++;
	}
}

The error I get is,

*** glibc detected *** ./a.out: double free or corruption (fasttop): 0x09ffe008 ***

I'm tired now, that's why I may just have missed something. Thanks for help...