Compilare: user.c: In function ‘main’: user.c:17:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &nrlin, &nrcol); ^ user.c:23:19: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &m[i][j]); ^ user.c:46:12: warning: ‘c’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(fout, "%d %d %d\n", a, b+1, c+1); ^ user.c:46:12: warning: ‘b’ may be used uninitialized in this function [-Wmaybe-uninitialized]