C#.NETで変換
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using System;

class DecToBin{
    static void Main(){
        //変数宣言
        int[] nisin = new int[16];

        //入力
        Console.Write("10進数を入力:");
        int jyu = Convert.ToInt32(Console.ReadLine());

        //変換
        for(int i=0; i<16; i++){
            nisin[i] = jyu % 2;	
            jyu = jyu / 2;
        }

        //出力
        for(int i=16-1; i>=0; i--){
            Console.Write(nisin[i]);
        }
    }
}

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