Try this code,
Code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#define MAXLINE 100
main()
{
FILE *fp;
FILE *new;
char buf[100];
char buf1[100];
int i;
int j;
if((new=fopen("new_file","w+"))==NULL)
perror("File open error");
if((fp=fopen("file","r+"))==NULL)
perror("File open error");
else
{
while (fgets(buf, MAXLINE, fp) != NULL) {
j=0;
for(i=0; i<=strlen(buf); i++)
{
if(!isalpha(buf[i]))
;
else
buf1[j++]=buf[i];
}
buf1[j]='\n';
buf1[j+1]='\0';
fputs(buf1,new);
}
}
fclose(fp);
fclose(new);
system("mv new_file file");
exit;
}