Dynamically allocating memories for matrix in c

If you want to create mxn matrix with malloc but not sure how, here's the way.

First of all, mxn matrix is m rows and n columns.

We can use double pointers to do this.

First you create memory space for m rows.

Then, you create memory space for n columns.

int ** mat; 

mat = malloc(m * sizeof(int*)); // we are creating memory space for int pointers. This basically means 'we want to create memory space that can hold memory address that can hold array of columns

// each of mat at i'th index is the memory address for each row
// so we need to allocate memories for each row now

for (int i = 0; i < m; i++) {
    mat[i] = malloc(n * sizeof(int));
}

Voila, we are done!