Write A Program To Detect Tokens In C


 

Create one text file

Input Text File

int main()
{
int a=10,b=20;
if(a>b)
return a;
else
return b;
}

Code

#include<stdio.h>
#include<ctype.h>
#include<string.h>
#include<stdlib.h>
void keyw(char *p);
int i=0,id=0,kw=0,num=0,op=0,sp=0,ar=0,count=0,new_line=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[20]=" \t\n,;(){}[]#\"<>",oper[]="!%^&*-+=~|.<>/?";
    int j;
    char fname[50];
    FILE *f1;
    f1 = fopen("Laxcode.txt","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++;
                count++;
                str[i]='\0';
                keyw(str);
            }
        }
        if(ch=='\n'){
        new_line++;
}
        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;
                    ar++;
                    count++;
                    break;
                }
                if(ch==',' || ch==';' || ch=='(' || ch==')' || ch=='{' || ch=='}' || ch=='[' || ch==']'){
                printf("%c is a Sepretor\n",ch);

                sp++;
                count++;
}
                str[i]='\0';
                keyw(str);
            }
        }
        if(i!=-1)
        {
            str[i]=ch;
            i++;
        }
        else
            i=0;
    }
    printf("\nKeywords: %d\nIdentifiers: %d\nOperators: %d\nNumbers: %d\nSepretor:%d\nArgument:%d",kw,id,op,num,sp,ar);
printf("\nTotal number of Token:%d",count);
printf("\n Number Of lines:%d",new_line);
}
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++;
            count++;
            flag=1;
            break;
        }
    }
    if(flag==0)
    {
        if(isdigit(p[0]))
        {
            printf("%s is a number\n",p);
            num++;
            count++;
        }
        else
{
            if(p[0]!='\0')
            {
                printf("%s is an identifier\n",p);
                id++;
                count++;
            }
        }
    }
    i=-1;
}

Output






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