Program to display inputted string in ascending triangle and descending triangle in C

#include 
#include 
void main(){
   char str[]="C Programming For You..";
   int i,choice;
   while(1){
   clrscr();
   printf("*****C Programming For You*****\n\n");
   printf("1) Ascending style\n");
   printf("2) Decending style\n");
   printf("3) Exit\n");
   printf("Enter your choice : ");
   scanf("%d",&choice);
   printf("\n\n");
   switch(choice){
   case 1:   //Ascending Stylefor(i=0;str[i]!='\0';i++)
      printf("%.*s\n",i,str);
      printf("%.*s\n",i,str);
      getch();
      break;
   case 2:   //Decending Stylefor(i=0;str[i]!='\0';i++);
         while(i>0){
        printf("%.*s\n",i,str);
        i--;
         }
         getch();
         break;
   case 3:   exit(1);
   default : printf("\n\nInvalid choice\n\n");
         getch();
   }
}
}