1 #include <stdio.h>
 2 #include <string.h>
 3 
 4 void reqorder(char *input,char *output,int counter)
 5 {
 6     int i=0, j=0;
 7     char *p=input;
 8     char *buf=NULL;
 9 
10     while((char)(*p)!=‘\0‘)
11     {
12         if((char)(*p)==‘?‘)
13         {
14             if(i==counter)
15             {
16                 buf=p+1;
17                 while((char)(*buf)!=‘\0‘ && (char)(*buf)!=‘?‘)
18                 {
19                     j++;
20                     buf++;
21                 }
22                 strncpy(output,p+1,j);
23                 return;
24             }
25             i++;
26         }
27         p++;
28     }
29 }
30 
31 int main()
32 {
33     char ch[32]="a?b?c?12?34?56?";
34     char a[8];
35     memset(a,0,8);
36     reqorder(ch,a,1);    
37     printf("%s\n", a);
38     return 0;
39 }