Parent process read 2 filenames and compare the sizes returned by child processes (reading of sizes are done parallelly by two child process)

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/stat.h>
int main(){
   int pid1,pid2,p1[2],p2[2],p3[2],p4[2],i,j,buffr3[2],buffr4[2],flag,n2=0;
   char buffr1[2][30],buffr2[2][30];
   struct stat filestat;
   pipe(p1);
   pipe(p2);
   pipe(p3);
   pipe(p4);
   pid1 = fork();
   switch(pid1){
     case -1:perror("main: fork");
     exit(1);
     case 0: read(p1[0],buffr1,sizeof(buffr1));
     printf("In child process (ID: %d)\n", getpid());
     stat(buffr1[0],&filestat);
     buffr3[0]=filestat.st_size;
     write(p3[1],buffr3,sizeof(buffr3));
     exit(1);
     break;
     default:
     pid2 = fork();
     switch(pid2){
       case -1:perror("main: fork");
       exit(1);
       case 0: read(p2[0],buffr1,sizeof(buffr1));
       printf("In child process (ID: %d)\n", getpid());
       stat(buffr1[0],&filestat);
      buffr3[0]=filestat.st_size;
      write(p4[1],buffr3,sizeof(buffr3));
      exit(1);
      break;
      default:
       printf("In parent process (ID: %d)\n", getpid());
       printf("\nEnter the files \n");
       gets(buffr1[0]);
      gets(buffr2[0]);
      write(p1[1],buffr1,sizeof(buffr1));
      write(p2[1],buffr2,sizeof(buffr2));
      waitpid(pid1,NULL,0);
      waitpid(pid2,NULL,0);
      read(p3[0],buffr3,sizeof(buffr3));
      read(p4[0],buffr4,sizeof(buffr3));
      if(buffr3[0]>buffr4[0])
        printf("\n%s is larger than %s\n",buffr1[0],buffr2[0]);
       else
         printf("\n%s is larger than %s\n",buffr2[0],buffr1[0]);
       break;
       }
     }

   return 0;
}