Compilare: main.c: In function 'main': main.c:23:3: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d ", &l, &c); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:101:3: warning: 'dt' may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(fout, "%d\n", dd+dt); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:101:3: warning: 'dd' may be used uninitialized in this function [-Wmaybe-uninitialized] main.c:41:10: warning: 'y1' may be used uninitialized in this function [-Wmaybe-uninitialized] v[0][1]=y1; ~~~~~~~^~~ main.c:40:10: warning: 'x1' may be used uninitialized in this function [-Wmaybe-uninitialized] v[0][0]=x1; ~~~~~~~^~~