1 #include
     
       2 using namespace std; 3  4 void ChangeSpace(char* buf,int len) 5 { 6     if(buf == NULL || len <= 0) return ; 7      8     int count = 0; 9     for(int i=0;i
      
       =0;i--)16     {17         if(buf[i] != ' ')18             buf[i+2*count] = buf[i];19         else 20         {21             count --;22             buf[i+2*count] = '%';23             buf[i+2*count+1] = '2';24             buf[i+2*count+2] = '0';25         }26     }27 28     return ;29 }30 31 int main()32 {33     char buf[64] = {
   0};34     strcpy(buf,"We Are Happy");35     ChangeSpace(buf,sizeof(buf));36     for(int i=0;i