package question1;
import java.util.Scanner;
public class question1 {
public static void main(String args[]) {
Scanner n = new Scanner(System.in);
System.out.println("用户请输入正整数");
String m = n.next();
int sum=0;
if(m!=null && m.matches("^[0-9]+$")){
int x = Integer.parseInt(m);
if((x==0) || (x==1)) {
System.out.println("no odd");
System.out.println("no even");
}
for(int i=0;i<x;i++) {
if(i % 2!=0) {
System.out.print(i+"\t");
}
}
System.out.println();
if(x==2) {
System.out.println("no even");
}
for(int i=0;i<x;i++) {
if(i % 2==0) {
sum+=sum+i;
}
}
if(sum!=0) {
System.out.println(sum);
}
}else{
System.out.println("格式不正确");
}
}
}
After receives a valid input,the program prints out:(1)all the positive odd numbers which are smaller than the input, and (2) the sum of all the even numbers which are smaller than the input.
