POJ系列——java

public static void main(String[] args) {

Scanner in = new Scanner(System.in);
while (in.hasNext()){
double c = in.nextDouble();
double sum = 0.0;
int n = 1;
if (c==0) {
return;
}
do {
n++;
sum = sum + 1.0 / n;
} while (sum<c);
System.out.println((n-1)+" card(s)");

}
}