#include 
     
      #include 
      
       #include 
       
        #include 
        
         int main(){        pid_t pid;        char *m;        int n;        pid=fork();        if(pid==0)        {                m="this is child";                n=5;        }        else        {                m="this is father";                n=3;            }        for(;n>0;n--)        {                puts(m);                sleep(1);        }        if(pid!=0)        {            pid_t child_pid;            child_pid=wait(NULL);                        printf("child has finished: %d\n",child_pid);                }        exit(0);}