count the no. of characters and no. of vowels in a file

this program demonstrates your how you can open a file and count number of character in that file and no of vowels in that file .....

#include<stdio.h>
#include<conio.h>
main()
{
//declare a file pointer   
FILE *fp;
//declare a variable character type "ch" to store a character when read a file
    char ch;
//declare integer variable "nov" to count no of vowels and "noc"  to count number of character in file
    int nov=0,noc=0;
    clrscr();
  //open file name x1.c 
fp=fopen("x1.c","r");
//start reading file till end
    while(1)
    {
  //get a single character in ch variable  
ch=fgetc(fp);
//check for end of file
  if(ch==EOF)
//exit while loop if file reached to end.
        break;
//add 1 noc
        noc++;
//get the variable in ch and check
        switch(ch)
        {
//add +1 to nov if ch is a e i o or u .....
           case'a':
              nov++;
              break;
           case'e':
              nov++;
              break;
           case'i':
              nov++;
              break;
           case'o':
              nov++;
              break;
           case'u':
              nov++;
              break;
           default:
              continue;
            }
           }
//close file      
fclose(fp);
//print number of character in file
        printf("\n number of characters=%d",noc);
//print number of vowels in file
        printf("\n number of vowels=%d",nov);
//wait for your key response       
getch();
        }