LEXICAL ANALYZER USING C

LEXICAL ANALYZER USING 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;
        }
output


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