Compilare: user.cpp: In function ‘int main()’: user.cpp:39:19: warning: unused variable ‘a’ [-Wunused-variable] int n,k,dif=0,a,b; ^ user.cpp:39:21: warning: unused variable ‘b’ [-Wunused-variable] int n,k,dif=0,a,b; ^ user.cpp: In function ‘void cit(int&)’: user.cpp:21:35: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,LIM,fila); ^ user.cpp:32:35: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff,1,LIM,fila); ^