Compilare: user.cpp: In function ‘int main()’: user.cpp:19:41: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d ", &nrlin, &nrcol); ^ user.cpp:48:33: warning: ‘semn’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(fout, "%d\n", y+semn*x); ^ user.cpp:48:35: warning: ‘y’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(fout, "%d\n", y+semn*x); ^