Compilare: user.c: In function ‘main’: user.c:28:5: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘long int’ [-Wformat=] fprintf(pg,"%d",a[2][3]); ^ user.c:27:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^ user.c:27:9: warning: unused variable ‘i’ [-Wunused-variable] int i,j; ^ user.c:25:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(pf,"%d %d",&l,&c); ^