Compilare: user.cpp: In function ‘void process_test()’: user.cpp:73:9: warning: variable ‘foo’ set but not used [-Wunused-but-set-variable] int foo = scanf("%s", book); ^ user.cpp: In function ‘int main()’: user.cpp:89:11: warning: variable ‘foo’ set but not used [-Wunused-but-set-variable] FILE* foo = freopen("carte.in", "r", stdin); ^ user.cpp:92:9: warning: unused variable ‘bar’ [-Wunused-variable] int bar = scanf("%d", &t); ^