Program to count characters in the file. 
 

#include<stdio.h>
#include<conio.h>
#include<ctype.h>
#include<stdlib.h>
#include<string.h>
int main(int argc,char *argv[])
{
FILE *fp;
int chr=0,spc=0,tab=,lin=0;
char ch;
if(argc < 2)
{
printf("\nUsage : %sfilename\n",argv[0]);
exit(1);
}
if((fp=fopen(argv[1],"r"))==NULL)
{
perror("\nCan't open file....\n");
}
while(!feof(fp0))
{
ch=fgetc(fp);
if(isalnum(ch))
chr++;
if(ch=='\t')
tab++;
if(ch=='\n')
lin++;
if(ch==' ')
spc++;
}
printf("Total characters: %d\n",chr);
printf("Total tabs : %d\n",tab);
printf("Total spaces : %d\n",spc);
printf("Total newlines : %d\n",lin);
fclose(fp);
return 0;
}