Compilare: user.cpp: In function ‘int main()’: user.cpp:25:15: warning: unused variable ‘j’ [-Wunused-variable] int n, i, j, val, s, d, k; ^ user.cpp:25:23: warning: unused variable ‘s’ [-Wunused-variable] int n, i, j, val, s, d, k; ^ user.cpp:25:26: warning: unused variable ‘d’ [-Wunused-variable] int n, i, j, val, s, d, k; ^ user.cpp: In function ‘void read(int&)’: user.cpp:14:90: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] while(buff[pos]<'0' || buff[pos]>'9')if(++pos==2000)pos=0,fread(buff, 1, 2000, stdin); ^ user.cpp:18:54: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++pos==2000)pos=0,fread(buff,1,2000,stdin); ^ user.cpp: In function ‘int main()’: user.cpp:24:32: 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, 2000, stdin); ^