C'de ufak bi soru

#include <stdio.h> 
  #include <stdlib.h> 
   
  int main(int argc, char *argv[]) 
  { 
      char a[50]; 
      printf("Kontrol edilecek kelimeyi girin:"); 
      gets(a); 
      char *p; 
      int i,con,aa=0,bb=0,aa2=0,bb2=0,ii=0; 
      p=a; 
      for(i=0;p[i];i++) 
  { 
  printf("%c",p[i]); 
  con=p[i]=='a' ? aa++ : 0 ; 
  con=p[i]=='B' ? bb++ : 0 ; 
  con=p[i]=='A' ? aa++ : 0 ; 
  con=p[i]=='b' ? bb++ : 0 ; 
  con=p[i]=='i' ? ii++ : 0 ; 
  } 
   printf("\n%d tane a var",aa); 
   printf("\n%d tane b var",bb); 
    printf("\n%d tane i var \n",ii); 
    system("PAUSE");	 
    return 0; 
  }