Lexical Analyzer Program in C

#include<stdio.h>
#include<string.h>
#include<stdlib.h>

int isIdent(char ch);
int isOper(char ch);
int isDel(char ch);
int isKey(char  *str);
void final();
void removeDuplicate();

char op[8]={'+','-','*','/','=','<','>','%'};
char del[9]={'}','{',';','(',')','[',']',',','#'};
char *key[]={"int","void","main","char","float","FILE"};

int idi=0,idj=0,j,opi=0,opj=0,liti=0,deli=0;
int uniqIdenti=0,uniqOpi=0,uniqDeli=0,keyi=0,consi=0;

char uniqIdent[20][20],uniqOp[20][20],uniqDel[20],keyword[20][20];
char ident[20][20],literal[20][30],lit[30],oper[20][20],delem[20],constant[20][20];

void lexAnalysis(char *str)
{
 int i=0,l;
 while(str[i]!='\0')
 {
  if(isIdent(str[i]))  // Check For Identifier
  {
   while(isIdent(str[i]))
   {
    ident[idi][idj++]=str[i++];
   }
   ident[idi][idj]='\0';
   idi++,idj=0;
  }
  else
  if(str[i]=='"')         // for literals 
      {
         l=0;
         lit[l++]=str[i];
         for(j=i+1;str[j]!='"';j++)
         {
            lit[l++]=str[j];
         }
         lit[l++]=str[j];
   lit[l]='\0';
         strcpy(literal[liti++],lit);
         i=j+1;
       
      }
  else
  if(isOper(str[i]))    // Check For Operator
  {
   while(isOper(str[i]))
   {
     oper[opi][opj++]=str[i++];
   }
      oper[opi][opj]='\0';
    opi++,opj=0;
   
  }
  else
  if(isDel(str[i]))     // Check For Delimeter
  {
      while(isDel(str[i]))
            {
              delem[deli++]=str[i++];
            }
   delem[deli]='\0'; 
  }
  else
  {
   i++;
  }  
 }
}

int isIdent(char ch)  // Check for Identifier
{
    if(isalpha(ch)||ch=='_'||isdigit(ch)||ch=='.')
 return 1;
 else
 return 0; 
}

int isOper(char ch)   // Check for Operator
{
   int f=0,i;
   for(i=0;i<8&&!f;i++)
   {
    if(ch==op[i])
    f=1;
   }
   return f;  
}

int isDel(char ch)    // Check for Delimeter
{
   int f=0,i;
   for(i=0;i<9&&!f;i++)
   {
    if(ch==del[i])
     f=1;
   }
   return f;  
}

int isKey(char *str)  // Check for keyword
{
   int i,f=0;
   for(i=0;i<6;i++)
   {
      if(!strcmp(key[i],str))
      f=1;
   }
  return f;
 
}

void removeDuplicate()
{
 int i,j,flag=1;
    for(i=0;i<deli;i++)    // Removing duplicate delemeters
    {
        flag=1;
  for(j=0;j<uniqDeli;j++)
  {
   if(delem[i]==uniqDel[j])
   {
    flag=0; break;
   }
  } 
     if(flag)
     uniqDel[uniqDeli++]=delem[i]; 
    }
    uniqDel[uniqDeli]='\0';
 
 for(i=0;i<idi;i++)    // Removing duplicate identifiers 
    {
        flag=1;
  for(j=0;j<uniqIdenti;j++)
  {
   if(!strcmp(ident[i],uniqIdent[j]))
   {
    flag=0; break;
   }
  } 
     if(flag)
     strcpy(uniqIdent[uniqIdenti++],ident[i]); 
    }
 
 
 for(i=0;i<opi;i++)    // Removing duplicate operator 
    {
        flag=1;
  for(j=0;j<uniqOpi;j++)
  {
   if(!strcmp(oper[i],uniqOp[j]))
   {
    flag=0; break;
   }
  } 
     if(flag)
     strcpy(uniqOp[uniqOpi++],oper[i]); 
    }

}

void final()
{
    int i=0;
    idi=0;
 
    for(i=0;i<uniqIdenti;i++)
    {
      if(isKey(uniqIdent[i]))   // Identifying Keyword
   strcpy(keyword[keyi++],uniqIdent[i]);
   else
   if(isdigit(uniqIdent[i][0]))    // Identifying constants
      strcpy(constant[consi++],uniqIdent[i]);
      else
      strcpy(ident[idi++],uniqIdent[i]);   // Identifier
    } 
}

void outputs()   //Printing the Outputs
{
 
int i;
     printf("\n\tDelemeter are : \n");
     for(i=0;i<uniqDeli;i++)
     printf("\t%c\n",uniqDel[i]);

     printf("\n\tOperators are : \n");
     for(i=0;i<uniqOpi;i++)
     {
      printf("\t");
      puts(uniqOp[i]);
     }

     printf("\n\tIdentifiers are : \n");
     for(i=0;i<idi;i++)
     {
          printf("\t");
          puts(ident[i]);
     }

      printf("\n\tKeywords are : \n");
      for(i=0;i<keyi;i++)
       {
           printf("\t");
           puts(keyword[i]);
       }

        printf("\n\tConstants are :\n");
        for(i=0;i<consi;i++)
       {
     printf("\t");
     puts(constant[i]);
    }

   printf("\n\tLiterals are :\n");
   for(i=0;i<liti;i++)
   {
        printf("\t");
      puts(literal[i]);
    }
}
int main()
{
   char filename[15];
   FILE *file;
   char line [ 128 ];
   printf("Enter The File Name :\n");
   scanf("%s",&filename);
   file = fopen ( filename, "r" );
    if ( file != NULL )
   {
       /* or other suitable maximum line size */
      while ( fgets ( line, sizeof line, file ) != NULL ) /* read a line */
      {
       lexAnalysis(line);
      }
      fclose( file );
      removeDuplicate();
      final();
      outputs();
   }
   else
   {
      perror( filename );  /* If file doesn't exist */
   } 
 
}

Input :

Enter the File Name :  Sample.c

Output :