0
#include<iostream>
#include<vector>
class triangular_matrix_t
{
private:
std::vector < std::vector<unsigned> > m_matrix;
unsigned m_gradiant;
public:
triangular_matrix_t (unsigned rows, unsigned initial_length = 1,
unsigned gradiant = 1): m_matrix (rows), m_gradiant (gradiant)
{
unsigned row_length = initial_length;
for (unsigned row=0; row<rows; ++row)
{
m_matrix[row].resize (row_length);
row_length += m_gradiant;
}
}
void set (unsigned row, unsigned column, unsigned value)
{
if (row<m_matrix.size())
{
if (column<m_matrix[row].size())
{
m_matrix[row].at(column) = value;
}
}
}
unsigned at(unsigned row, unsigned column)
{
if (row<m_matrix.size() && column<m_matrix[row].size())
return(m_matrix[row].at(column));
return 0;
}
unsigned get_height() const {
return(m_matrix.size()); }
unsigned get_length(const unsigned row) const {
return row<m_matrix.size() ? m_matrix[row].size() : 0; }
unsigned get_gradiant() const {
return m_gradiant; }
};
std::ostream& operator<< (std::ostream& os, triangular_matrix_t& matrix)
{
for (unsigned row=0; row<matrix.get_height(); ++row)
{
for (unsigned col=0; col<matrix.get_length(row); ++col)
{
os << matrix.at(row, col) <<'\t';
}
os << std::endl;
}
return os;
}
int main()
{
triangular_matrix_t matrix (10);
for (unsigned row=0; row<matrix.get_height(); ++row)
{
for (unsigned col=0; col<matrix.get_length(row); ++col)
{
matrix.set (row, col, (row+1)*(col+1));
}
}
std::cout << "Triangular matrix with 10 rows:\n" << std::endl;
std::cout << matrix << std::endl;
}
Output:
Triangular matrix with 10 rows:
1
2 4
3 6 9
4 8 12 16
5 10 15 20 25
6 12 18 24 30 36
7 14 21 28 35 42 49
8 16 24 32 40 48 56 64
9 18 27 36 45 54 63 72 81
10 20 30 40 50 60 70 80 90 100
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