Got stuck in a customizable dimensional matrix operation program - c

Question

`
//MATRIX INPUT
#include<stdio.h>
int main(void)
{
//declaring variables
size_t row=0;
size_t column=0;
int limit=0;
int en=0;
int mat[row][column];
//starting
printf("ENTRE THE NUMBER OF R
EPETITIONS OF MATRIX
INPUT:");
scanf("%d",&limit);
//starting loop
for(int i=0;i<=(limit-1);++i)
{
printf("\nINITIALIZED THE
MATRIX-%d...\n",i+1);
printf("\nENTER ROW
NUMBER FOR MATRIX:\n");
scanf("%d",&row);
printf("\nENTER COLUMN
NUMBER FOR MATRIX:\n");
scanf("%d",&column);
//entering the entries..
for(int j=0; j<row ;++j)
{
for(int k=0;
k<column;++k)
{
printf("ENTRY (%d,%d):",(j+1),(k+1));
scanf("%d",&mat[k][j]);
}
}
}
//starting the console output
of matrix
int v=0;
printf("Which matrix do you
want to see?\n");
scanf("%d",&v);
for(v=0; v<=limit; ++v)
{
for(int l=0; l<row; ++l)
{
for( int m=0; m<column;
++m)
{
printf("%2d", mat[m][l]);
}
}
}
return 0;
}`
I have written a program in C where the user can firstly define the number of matrices. Then, the dimension of individual matrix is defined. I have successfully proceeded to individual matrix input. But I am stuck in writing the operational codes like multiplying and adding matrices as well as to write code for showing output in matrix style.
How to fix this?
incomplete source code
Console of output

Answer 1

I couldn't get the part why you created an empty static array, and then changed its boundaries at least tried to change. However, I believe dynamic array allocation would serve your purpose better than static one. I implemented a 3D array that has the first index as matrices, the second index as rows of the current matrix, and the third index as columns of the current matrix. Also, fixed the display method, you have been using. However, there can be different-sized matrices for each matrix you have. Therefore, I implemented another list to keep track of the rows and columns. Lastly, I put two links at the top of the code that you can implement addition and multiplication operations by yourself. You can see the code from here:
//MATRIX INPUT
#include<stdio.h>
#include<stdlib.h>
//Add two matrices
//https://www.programmingsimplified.com/c-program-add-matrices
//Multiplying two matrices
//https://www.programiz.com/c-programming/examples/matrix-multiplication
void display_matrix(int** , int , int );
void fillWithNum(int**,int,int,int);
int main(void)
{
//declaring variables
size_t row=0;
size_t column=0;
int limit=0;
int en=0;
int ***mat;
//starting
printf("ENTRE THE NUMBER OF REPETITIONS OF MATRIX INPUT:");
scanf("%d",&limit);
mat = (int***)malloc(sizeof(int**) * limit);
//Two keep track of the rows and columns
//First index of the second dimension will be rows, and
//second index will be columns of matrices at the mat variable.
int **indexingList;
indexingList = (int**)malloc(sizeof(int*) * limit);
for(int i=0;i<limit;++i) {
indexingList = (int*) malloc(sizeof(int) * 2);
}
//starting loop
for(int i=0;i<limit;i++)
{
printf("\nINITIALIZED THE MATRIX-%d...\n",i+1);
printf("\nENTER ROW NUMBER FOR MATRIX:\n");
scanf("%d",&row);
printf("\nENTER COLUMN NUMBER FOR MATRIX:\n");
scanf("%d",&column);
mat[i] = (int**) malloc(row * sizeof(int*));
for (int j = 0;j < row;j++) {
mat[i][j] = (int*)malloc(column * sizeof(int));
}
//entering the entries..
for(int j=0;j < row;j++)
{
for(int k=0;k < column;k++)
{
printf("ENTRY (%d,%d):",(j+1),(k+1));
scanf("%d",&mat[i][j][k]);
}
}
indexingList[i][0] = row;
indexingList[i][1] = column;
}
//starting the console output of matrix
int v=1;
printf("Which matrix do you want to see?\n");
scanf("%d",&v);
//v-1 because if user want to display first matrix it should be 0, so user will enter 1
//therefore, 1-1 will give us 0 to display 0 index matrix
display_matrix(mat[v-1], indexingList[v-1][0], indexingList[v-1][1]);
//Problem at freeing memory for some purpose crash at here.
//I couldn't figure it out as well.
for(int i = 0;i < limit;i++) {
for(int j = 0;j < indexingList[i][0];j++) {
free(mat[i][j]);
}
free(mat[i]);
}
free(mat);
for(int i = 0;i < limit;i++) {
free(indexingList[i]);
}
free(indexingList);
return 0;
}
void display_matrix(int** matrix, int r, int c) {
for(int i = 0 ;i < r;i++){
for(int j = 0;j < c;j++) {
printf("%d\t",matrix[i][j]);
}
printf("\n");
}
}
//Test purpose
void fillWithNum(int** arr,int r, int c, int num) {
for (int i = 0;i<r;i++) {
for(int j = 0;j<c;j++) {
arr[i][j] = num;
}
}
}
However, this code also crashes at the end of the memory-freeing part. I couldn't figure out why, but if someone finds it out as well, I would appreciate it.