Lexical Analyzer in C

#include<stdio.h>
#include<ctype.h>
#include<string.h>
void keyw(char *p);
int i=0,id=0,kw=0,num=0,op=0;
char keys[32][10]={"auto","break","case","char","const","continue","default",
"do","double","else","enum","extern","float","for","goto",
"if","int","long","register","return","short","signed",
"sizeof","static","struct","switch","typedef","union",
"unsigned","void","volatile","while"};

main()
{
	char ch,str[25],seps[15]=" \t\n,;(){}[]#\"<>",oper[]="!%^&*-+=~|.<>/?";
	int j;
	char fname[50];
	FILE *f1;
	//clrscr();
    printf("enter file path (drive:\\fold\\filename)\n");
    scanf("%s",fname);
    f1 = fopen(fname,"r");
    //f1 = fopen("Input","r");
	if(f1==NULL)
	{
	 printf("file not found");
	 exit(0);
	}
	while((ch=fgetc(f1))!=EOF)
	{
      for(j=0;j<=14;j++)
      {
        if(ch==oper[j])
        {
          printf("%c is an operator\n",ch);
          op++;
          str[i]='\0';
          keyw(str);
        }
      }
      for(j=0;j<=14;j++)
      {
        if(i==-1)
          break;
        if(ch==seps[j])
        {
          if(ch=='#')
          {
            while(ch!='>')
            {
              printf("%c",ch);
              ch=fgetc(f1);
            }
            printf("%c is a header file\n",ch);
            i=-1;
            break;
          }
          if(ch=='"')
          {
            do
            {
              ch=fgetc(f1);
              printf("%c",ch);
            }while(ch!='"');
            printf("\b is an argument\n");
            i=-1;
            break;
          }
          str[i]='\0';
          keyw(str);
        }
      }
      if(i!=-1)
      {
        str[i]=ch;
        i++;
      }
      else
        i=0;
	}
    printf("Keywords: %d\nIdentifiers: %d\nOperators: %d\nNumbers: %d\n",kw,id,op,num);
//getch();
}
void keyw(char *p)
{
  int k,flag=0;
  for(k=0;k<=31;k++)
  {
    if(strcmp(keys[k],p)==0)
    {
      printf("%s is a keyword\n",p);
      kw++;
      flag=1;
      break;
    }
  }
  if(flag==0)
  {
    if(isdigit(p[0]))
    {
      printf("%s is a number\n",p);
      num++;
    }
    else
    {
      //if(p[0]!=13&&p[0]!=10)
      if(p[0]!='\0')
      {
        printf("%s is an identifier\n",p);
        id++;
      }
    }
  }

  i=-1;
}