#include<stdio.h>
void to_binary(unsigned long n);

void main(){
    int n;
    scanf("%d",&n);
    if(1){
        printf("input one integer:\n");
        printf("output the binary:\n");
              to_binary(n);
    }

    void to_binary(unsigned long n){
        unsigned long n;
        int r=0;
        r=n%2;
        if(n>2){
            to_binary)(n);
         }
    }
C:\vc\cprogram\binary\binary.c(13) : error C2143: syntax error : missing ';' before 'type'
C:\vc\cprogram\binary\binary.c(15) : error C2143: syntax error : missing ';' before 'type'
C:\vc\cprogram\binary\binary.c(16) : error C2065: 'r' : undeclared identifier
C:\vc\cprogram\binary\binary.c(18) : error C2059: syntax error : ')'
这几个错误时哪里啊，谁帮我看下，

#include<stdio.h>

#include<stdlib.h>
//直接用函数itoa就行了
void main()
{
    int n;
    char ch[100];
    printf("input one integer:\n");
    scanf("%d",&n);
     itoa(n,ch,2);
    printf("output the binary:%s\n",ch);
   
  }

main函数少一个}，to_binary)(n);这多一个），程序整体有点乱。

我改过来，确实有些细节没注意，谢谢了