Compilare: user.c: In function ‘main’: user.c:39:27: warning: unused variable ‘x’ [-Wunused-variable] int con,m,n,l,i,lSize,x; ^ user.c:47:10: warning: ignoring return value of ‘fread’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer,1,lSize,fi); ^ user.c:65:16: warning: ‘l’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(i=0;i<l-1;i++) ^