编写一个程序 输入一个整数使用 if esle语句

 public static void main(String[] args){
   Scanner input = new Scanner(System.in);
        System.out.println("请输入：");
        int num=input.nextInt();

        if(num>0){
            num=num+100;
        }else{
            num=num+500;
        }
        System.out.println(num);
}

public class test {
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        System.out.println("please input:");
        String a = s.nextLine();
        
        int k=Integer.parseInt(a);
        if (k>0) {
            k+=100;
        }else {
            k+=500;
        }
        System.out.println(k);

    }

}

#include <stdio.h>

int main()
{
printf("请输入一个数:");
int n;
scanf("%d",&n);
if(n>0){
printf("%d\n",100+n);
}
else{
printf("%d\n",500+n);
}
return 0;
}