Compilare: user.cpp: In function ‘int main()’: user.cpp:12:9: warning: unused variable ‘i’ [-Wunused-variable] { int i,lg,sum=0,nr=0,ok,nr_fake; ^ user.cpp:12:11: warning: unused variable ‘lg’ [-Wunused-variable] { int i,lg,sum=0,nr=0,ok,nr_fake; ^ user.cpp:12:25: warning: unused variable ‘ok’ [-Wunused-variable] { int i,lg,sum=0,nr=0,ok,nr_fake; ^ user.cpp:18:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%c",&c); ^ user.cpp:23:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%c",&c); ^