int?主()
{
int?a;
而(?scanf("%d ",& ampa)?!=?EOF?)
如果(?a & gt0?& amp& amp?a & lt10?){
printf("%d\n ",a * 10);
}別的?如果(?答?& lt=?20?){
printf("%d\n ",a);
}否則{
printf("%.3lf\n ",雙(a)?/?10.0);
}
回歸?0;