Counts the number of bytes in a file

#include
#include
#include

main( )
{
FILE* fptr;
char extension[] = ".c";

char file_name[FILENAME_MAX]; /* defined in stdio.h*/
int char_count;

printf("\n\n\tFile name (NO extension):\t");
scanf("%s",file_name);
strcat(file_name,extension);
fptr=fopen(file_name,"rb");

for(char_count=0; getc(fptr) !=EOF; ++char_count);
printf("\n\tByte size:\t%d", char_count);
fclose(fptr);

return EXIT_SUCCESS;
}