C十进制转二进制

思路：除二逆取余法

code

#include <stdio.h> void toBinary(int num)          //方法一{    int bin[1000],i=0,j;    while(1)    {        if(num==0)break;        bin[i++] = num%2;        num/=2;    }    for(j=i-1;j>=0;j--)    printf("%d ",bin[j]);}void toBinary1(int num)         //方法二(略){    //可用递归 }int main(){    int num;    scanf("%d",&num);#if 1    toBinary(num);#else    toBinary1(num);#endif;    return 0;}