Synchronizing alternatively two processes in Linux C

TI need two son processes to do this:

• Son process 1 should printf even numbers between 0 and 100.


• Son process 2 should printf odd numbers between 0 and 100.

What I should see in terminal after execution is: 0 1 2 4..100

How can I do this?

I tried this program, but it doesn't work, it only gives me the first integer 0:

#include <unistd.h>
 #include <stdio.h>
 #include <signal.h>
 
 void handler1(int sig)
 {
   if(sig == SIGCONT)
   {
      raise(SIGCONT);
   }
 }
 
 void handler2(int sig)
 {
   if(sig == SIGCONT)
   {
      raise(SIGCONT);
   }
 }
 
 int main()
 {
   int i=-1;
 
   if(fork()==0)
   { 
      signal(SIGCONT,handler1);
      while(1)
      {
 
         printf("%d\n",i+1);
         pause();
         kill(getpid()+1,SIGCONT);
      }
   }
 
   if(fork()==0)
   {
      signal(SIGCONT,handler2);
      while(1)
      {
        pause();
 
        printf("%d\n",i+1);
        kill(getpid()-1,SIGCONT);
      }
   }
 
 } 
 

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