1 #include <stdio.h> 2 #include <stdlib.h> 3 #include<string.h> 4 #include <time.h> 5 //#include<math.h> 6 // 7 //#include<iostream> 8 //using namespace std; 9 10 #include<stdio.h> 11 12 char temp[50] = "";13 14 void f(int n) 15 { 16     int a;17     char b[5];18     if(n) 19         f(n/2); 20     else 21         return; 22     a = n%2;23     printf("%d",a);24     sprintf(b,"%d",a);25     strcat(temp,b);26 } 27 28 int main() 29 { 30     int n; 31     while(1) 32     { 33         memset(temp,0,50);34         scanf("%d",&n); 35         if(n<0) 36             break; 37         if(n==0) 38             printf("0"); 39         f(n); 40         printf("\n"); 41         printf("temp:%s\n",temp);42     } 43     return 0; 44 }