A basic C programs for using 2D arrays and doing matrix operations

matrix.c

#include <stdio.h>
#include <stdlib.h>

int main() {
  int row, col;
  printf("enter row and col:");
  scanf("%d %d", &row, &col);

  int **mat;
  mat = calloc(row, sizeof(int *));
  if (mat == NULL) {
    printf("memory error");
    return 1;
  }
  for (int i = 0; i < row; i++) {
    mat[i] = calloc(col, sizeof(int));
    if (mat[i] == NULL) {
      printf("memory error");
      return 1;
    }
    for (int j = 0; j < col; j++) {
      printf("matrix elements [%d, %d]:", i, j);
      scanf("%d", &mat[i][j]);
    }
  }
  printf("mem alloc done");
  for (int i = 0; i < row; i++) {
    free(mat[i]);
    for (int j = 0; j < col; j++) {
      printf("%d ", mat[i][j]);
    }
    printf("\n");
  }
  free(mat);
  return 0;
}