Compilare: main.c: In function 'main': main.c:28:2: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d%d", &v, &m, &n); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:29:2: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%c", &end); ^~~~~~~~~~~~~~~~~~~~~ main.c:33:4: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%c", &a1[i][j]); ^~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:36:3: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%c", &end); ^~~~~~~~~~~~~~~~~~~~~