1 #include<stdio.h> 2 int main() 3 { 4     int n,a[20],i,j; 5     while(scanf("%d",&n)!=EOF&&n>0) 6     { 7          8         for(i=0;n/2.0!=0;i++) 9         {10             a[i]=n%2;11             n=n/2;12         }13         for(j=i-1;j>=0;j--)14             printf("%d",a[j]);15         printf("\n");16 17     }18 }