Eroare de compilare: user.c: In function ‘main’: user.c:28:5: error: ‘f2’ undeclared (first use in this function) f2=fopen("perechi.out","w"); ^ user.c:28:5: note: each undeclared identifier is reported only once for each function it appears in user.c:26:16: warning: unused variable ‘F2’ [-Wunused-variable] FILE *f1, *F2; ^ user.c:30:5: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f1,"%d",&n); ^