File : Count Character in C Programming

File : Count Character in C Programming
Code:
  #include<stdio.h>
#include<ctype.h>
#include<stdlib.h>
int main(void)
{
  FILE *fptr=NULL;
  char c[2],get;
  int ch;
  int count=0;
  char filename[100];
  printf("Enter the file name\n");
  scanf("%19s",filename);
  fptr=fopen(filename,"r");
  printf("Enter the character to be counted\n");
  scanf(" %s",c);

  if(fptr==NULL)
  {
    exit(-1);
  }

  if(((int)c[0]>=65)&&((int)c[0]<=122))
  {
    if(((int)c[0]>=97)&&((int)c[0]<=122))
      ch=(int)c[0]-32;
    else
      ch=(int)c[0]+32;
  }

  do{
    get=fgetc(fptr);
    if(((int)get==ch)||get==c[0])
      count=count+1;
  }while(get!=EOF);

   
  printf("File '%s' has %d instances of letter '%s'.",filename,count,c);
  fclose(fptr);
  return 0;
}