Compilare: user.cpp: In function ‘int main()’: user.cpp:9:33: warning: unused variable ‘j’ [-Wunused-variable] int k,ind=0,lprop,total=0,i,j,x,d,put,grad,nrdiv; ^ user.cpp:9:43: warning: variable ‘grad’ set but not used [-Wunused-but-set-variable] int k,ind=0,lprop,total=0,i,j,x,d,put,grad,nrdiv; ^ user.cpp:7:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("grad.in","r",stdin); ^ user.cpp:8:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("grad.out","w",stdout); ^ user.cpp:10:15: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(prop); ^ /tmp/ccHv7Yef.o: In function `main': user.cpp:(.text.startup+0x56): warning: the `gets' function is dangerous and should not be used.