c language octal binary transfer

/*

Code integrity, and friends can go to their own copy machine to run
    ideas:
    1, octal open
    2, find each binary digit, and the presence of the array from the back
    3, print two-dimensional array    
    * /

 

#include<stdio.h>
#include<math.h>
#include<string.h>


  void tobin(int present,int bit,int arr[10][3]){
	int j = 2;
	while(present){

		if(present%2)
			arr[bit][j] = present%2;//如果是1，则修改数组

		present/=2;
		j--;
	}

}

void show(int arr[10][3],int bit){

	
	for(int i = bit-1; i >=0; i-- ){

		for(int j = 0; j < 3; j++)
			
				printf("%d",arr[i][j]);
	
		
	}//外for
	printf("\n");
}


int main(){

	/*
	思路：
	1、八进制书拆开
	2、对每一位数求二进制，并从后往前存在数组里
	3、打印二维数组	
	*/

	void tobin(int prensent,int bit,int arr [10][3]);
	void show(int arr[10][3],int bit);
	int a,arr[10][3] = {0},present,bit = 0;

	scanf("%d",&a);

	//拆
	while(a){


	present = a%10;

	tobin(present,bit,arr);

	bit++;//记录几位

	a/=10;

	}

	//	printf("bit====%d\n",bit);


	show(arr,bit);


return 0;
}