Question

编写Java程序，判断用户输入的数字是否为正数，如果是则计算其阶乘

Answer 1

import java.util.*;
public class JieCheng{
public static void main(String[] args){
Scanner scanner = new Scanner(System.in);
while(scanner.hasNext()){
String str = scanner.next();
int zs = Integer.parseInt(str);
if(zs > 0){
int jc = 1;
for (int i = 1;i <= zs ;i++ ) {
jc *= i;
}
System.out.println(zs + "的阶乘为" + jc);
}
}
}
}