code. compile. run. debug. share.
#include <bits/stdc++.h>
using namespace std;
class matrix
{
int size;
int *a;
public:
matrix(int size) //Matrix class
{
this->size = size;
a = new int[(size * (size - 1) / 2)]; //creating 1-D array to store values
}
void set(int i, int j, int val) //Function to set values in array "a".
{
if (i >= j)
a[((i * (i - 1)) / 2) + (j - 1)] = val;
}
void display() //function to display values
{
for (int i = 0; i < size; i++)
{
for (int j = 0; j < size; j++)
{
if (i >= j)
cout << a[((i * (i - 1)) / 2) + (j - 1)] << " ";
else
cout << "0 ";
}
cout << endl;
}
}
};
int main()
{
int n = 3; //dimension of matrix
matrix a(n);
for (int i = 0; i < n; i++) //entering the values
{
int val;
for (int j = 0; j < n; j++)
{
cin >> val;
a.set(i, j, val);
}
}
a.display();
return 0;
}
Compiling Program...
Standard Input:
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Text
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