rand.cpp

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <ctime>

using namespace std;

int main(int argc, char const *argv[])
{
	int sz,sm=0;
	double mean;
	srand(time(NULL));
	int *dynamic_arr,*dynamic_arr2;
	cout<<"Step 1:\n";
	cout<<"Enter array size: ";
	cin>>sz;
	cout<<"Starting address of array: "<<dynamic_arr<<endl;
	cout<<"The elements of array:\n";
	for(int i=0;i<12;i++){
		cout<<*(dynamic_arr+i)<<"\t";
		if(i%4==3)
			cout<<endl;
	}
	cout<<"\nStep 2:\n";
	dynamic_arr = new int[sz];
	cout<<"Set the array as random numbers:\n";
	cout<<"The elements of array:\n";
	for(int i=0;i<sz;i++){
		*(dynamic_arr+i) = rand()%100+1;
		cout<<*(dynamic_arr+i)<<"\t";
		sm += *(dynamic_arr+i);
		if(i%4==3)
			cout<<"\n";
	}
	mean = (double)(sm)/(double)(sz);
	cout<<"The mean of the array elements: "<<mean<<endl;
	
	cout<<"\nStep 3:\nDelete dynamic_array.\n";
	delete dynamic_arr;
	cout<<"The value of pointer dynamic_arr: "<<dynamic_arr<<endl;
	cout<<"12 integers Starting from dynamic_arr:\n";
	for(int i=0;i<12;i++){
		cout<<*(dynamic_arr+i)<<" ";
	}
	cout<<endl;
	cout<<"\nStep 4:\nCreating and initialising, deleting dynamic_arr2 for 2000000 times.\n";
	dynamic_arr2 = new int[1000]();
	for(long int i=0;i<2000000;i++){
		delete dynamic_arr2;
		dynamic_arr2 = new int[1000]();
	}
	cout<<"The value of pointer dynamic_arr: "<<dynamic_arr<<endl;
	cout<<"12 integers Starting from dynamic_arr:\n";
	for(int i=0;i<12;i++){
		cout<<*(dynamic_arr+i)<<"\t";
		if(i%4==3)
			cout<<endl;
	}
	return 0;
}