斐波那契数列和十进制转二进制

import java.util.Scanner;

        public class Fei {
            public static void main(String[] args) {
                Scanner sc=new Scanner(System.in);
                System.out.println("请输入要输出几个数：");
                int num =sc.nextInt();
                int a=1;
                int b=1;
                int c=0;
                for (int i=1;i<=num;i++)
                    if (i==1||i==2){
                        System.out.print(1 + "t");
                    }else{
                        c=a+b;
                        a=b;
                        b=c;
                        System.out.print(c + "t");
                    }
    }
}
十进制转二进制

package Add;

import java.util.Scanner;

public class Er {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        System.out.println("请输入一个整数：");
        int a=sc.nextInt();
        String b="";
        while(a!=0){
            int i=a%2;
            b=i+b;
            a=a/2;
        }
        System.out.println(b);
    }
}