How to create a default size array
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|
#ifndef ARRAY_H
#define ARRAY_H
using namespace std;
#include <iostream>
class Array {
private:
double* p_arr = nullptr;
int size = 5;
public:
Array();
Array(int);
~Array();
void fill_array();
double find_avrg();
int maximum();
void reverse();
void print_array(ostream &);
int getSize(){return size;}
};
#endif
#include <iostream>
#include <string>
#include <ostream>
#include <cstdlib>
#include <iomanip>
//#include "Array.h"
using namespace std;
Array::Array()
{
cout << " Default constructor called" << endl;
}
Array::Array(int arr_size)
{
if(arr_size < size)
size = 5;
else
size = arr_size;
p_arr = new double [size];
cout << "Overloaded constructor called " << endl;
}
Array::~Array()
{
delete[] p_arr;
cout << "Destructor is Called " << endl;
}
void Array::fill_array() {
for (int i = 0; i < size; i++) {
p_arr[i] = rand() % 20 + 10;
cout << "Filling array " << p_arr[i] << endl;
}
}
double Array::find_avrg()
{
double avg, sum = 0.0;
for (int i = 0; i < size; i++) {
sum += p_arr[i];
}
sum = sum / size;
avg = sum;
cout << "Average is = " << avg << endl;
return avg;
}
void Array::print_array( ostream & out)
{
for (int i = 0; i < size; i++)
out
<< fixed << setw(5) << setprecision(3) << p_arr[i] << " "
<< setw(15) << &p_arr[i] << " " << endl;
}
int Array::maximum()
{
if (size == 0)
return -1;
double* max_pos = p_arr;
for (int i = 1; i < size; ++i) {
if (p_arr[i] > *max_pos) {
max_pos = &p_arr[i];
}
}
cout << "Max value is : " << *max_pos << endl;
return *max_pos;
}
void Array::reverse()
{
double comp, * last;
double * first = p_arr;
last = &p_arr[size - 1];
for (int i = 0; i < size / 2; i++) {
comp = *first;
*first = *last;
*last = comp;
first++;
last--;
}
}
#include <iostream>
#include <string>
//#include "Array.h"
using namespace std;
int main()
{
Array arr_1;
std::cout << "Size: " << arr_1.getSize() << '\n';
int sz;
std::cout << "Input size: ";
std::cin >> sz;
Array arr(sz);
std::cout << "Size: " << arr.getSize() << '\n';
arr.fill_array();
arr.print_array(cout);
arr.find_avrg();
arr.maximum();
arr.reverse();
arr.print_array(cout);
arr.reverse();
return 0;
}
| |
Default constructor called
Size: 5
Input size: 0
Overloaded constructor called
Size: 5
Filling array 17
Filling array 19
Filling array 23
Filling array 28
Filling array 20
17.000 0x100504270
19.000 0x100504278
23.000 0x100504280
28.000 0x100504288
20.000 0x100504290
Average is = 21.400
Max value is : 28.000
20.000 0x100504270
28.000 0x100504278
23.000 0x100504280
19.000 0x100504288
17.000 0x100504290
Destructor is Called
Destructor is Called
Program ended with exit code: 0 |
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