c - Why is this Annoying Line interfering with my output? -

i have piece of code developed address problem have in large program developing.

#include <stdio.h> #include <unistd.h> #include <stdlib.h> #include <cstring>  #include <cstdlib>  #include <sys/types.h> #include <sys/wait.h> #include <errno.h> #include <limits.h> #include <string> #include <iostream>  using namespace std; void processline (char []); void readline(char []);  const int limit = 512; int main(int argc, char *argv[]) {     char oneline[line_max];     readline(oneline);       return 0; } void readline(char line[]) {     processline(line);     printf("annoying line\n"); } void processline(char line[]) {      pid_t process;     int child_status;      string input;     cout << "input: ";     cin >> input;           process = fork();         if(process == 0)         { // nothing         }         else          {                         //parent                     if(input == "quit")             {                 printf("quit command found ! \nexiting ");                  for(int = 0;i < 3;i++)                 {                     printf(".");                     fflush(stdout);                     sleep(1);                  }                  printf("\n");                     exit(0);                         }             else             {                 wait(&child_status);             }         }  } 

my goal simple, when user enter quit.

i display

quit command found

exiting ...

and there delay of 1 second between each of these 3 dots.

however output

quit command found

exiting . annoying line..

i wonder how come annoying line prints after first dot, though it's calling function , not it's turn printed terminal ????

any ideas. spent 10 hours trying fix

in child process // nothing falls through , returns main() , prints line. fork() makes 2 copies both continue executing. child calls exec() run else (never returning), aren't doing that.