Compilare: user.c: In function ‘main’: user.c:20:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.c: In function ‘cmmdc’: user.c:13:2: warning: ‘s’ may be used uninitialized in this function [-Wmaybe-uninitialized] return s; ^ user.c: In function ‘main’: user.c:28:6: warning: ‘s’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(cmmdc(i,j)==1) ^