把十进制数据转换为计算机存储的二进制数据

#include <iostream>
    
    using namespace std;
    
    void mDecToBinary( int num ) { 	int a[35] = {0}; 	int numLength = 0;
    	int i = 0;
    
    	for( int i=0; i<35; i++ ) 	{ 		if( num < 1 ) 		{ 			break; 		}
    
    		a[i] = num % 2; 		num = num / 2; 		numLength++; 	}
    
    	for( i=numLength-1; i>0; i-- ) 	{ 		printf( "%d", a[i] ); 	} }
    
    void main() { 	int data = 0; 	printf("请输入data:"); 	scanf("%d",
    &data);
    
    	mDecToBinary(data); }