Prpgram to count vowels in given string by using vfork method (use of Vfork Function in c)

#include "stdio.h"
#include "dirent.h"
int main()
{
       int j,n,a,i,e,o,u;
       char str[50];
       a=e=i=o=u=0;
       pid_t pid;
       if((pid=vfork())<0)
        {
                perror("FORK ERROR");
                exit(1);
        }
        if(pid==0)
        {
                printf("Enter the String to count vowels:");
                gets(str);
                _exit(1);
        }
        else
        {
                n=strlen(str);
                for(j=0;j
                {
                        if(str[j]=='a' || str[j]=='A')
                                a++;
                        else if(str[j]=='e' || str[j]=='E')
                                e++;
                        else if(str[j]=='i' || str[j]=='I')
                                i++;
                        else if(str[j]=='o' || str[j]=='O')
                                                 o++;
                        else if(str[j]=='u' || str[j]=='U')
                                u++;
                }
                printf("Vowels Counting");
                printf("Number of A  : %d",a);
                printf("Number of E  : %d",e);
                printf("Number of I  : %d",i);
                printf("Number of O  : %d",o);
                printf("Number of U  : %d",u);
                printf("Total vowels : %d",a+e+i+o+u);
                exit(1);
        }
}