Why is my display function not running C++ Structs Matrix Transpose? - c++

Question

My program is about taking the transpose of a matrix and displaying it, using structs. I'm using pointer to structs in each function, just for practice although I could've done it by simply passing the struct or by reference. The program is working fine until function inputMatrix. The program takes input and then finishes executing without any output.
What I know for sure is the problem is in display function or structure trans I'm creating in main(which has the final result).
My code is below:
#include <iostream>
#include <iomanip>
using namespace std;
struct Matrix
{
int **data;
int rows;
int columns;
};
void createMatrix(Matrix *mat)
{
mat->data = new int *[mat->rows];
for (int i = 0; i < mat->columns; i++)
{
mat->data[i] = new int[mat->columns];
}
}
void inputMatrix(Matrix *mat)
{
for (int i = 0; i < mat->rows; i++)
{
for (int j = 0; j < mat->columns; j++)
{
cout << "Enter element of row " << i + 1 << " and column " << j + 1<<endl;
cin >> mat->data[i][j];
}
}
}
Matrix transpose(Matrix* mat)
{
Matrix transpose;
transpose.rows = mat->rows;
transpose.columns = mat->columns;
for (int i = 0; i < mat->rows;i++)
{
for(int j = 0;j<mat->columns;j++)
{
transpose.data[i][j] = mat->data[j][i];
}
}
return transpose;
}
void display(Matrix* mat)
{
for(int i = 0;i<mat->rows;i++)
{
for(int j = 0;j<mat->columns;j++)
{
cout<<setw(3)<<mat->data[i][j];
}
cout<<endl;
}
}
int main()
{
Matrix mat;
cout<<"Enter the rows of matrix: \n";
cin>>mat.rows;
cout<<"\nEnter the columns of matrix: \n";
cin>>mat.columns;
createMatrix(&mat);
inputMatrix(&mat);
cout<<endl;
Matrix trans = transpose(&mat);
display(&trans);
return 0;
}

Answer 1

The problem was in function transpose, I needed to allocate memory to Matrix transpose
The code is below:
Matrix transpose(Matrix* mat)
{
Matrix transpose;
transpose.rows = mat->rows;
transpose.columns = mat->columns;
createMatrix(&transpose);
for (int i = 0; i < mat->columns;i++)
{
for(int j = 0;j<mat->rows;j++)
{
transpose.data[i][j] = mat->data[j][i];
}
}
return transpose;
}