#include<string.h>
#include<ctype.h>
#include<stdio.h>
#include<stdlib.h>
void keyword(char str[10])
{
if(strcmp("for",str)==0||strcmp("while",str)==0||strcmp("do",str)==0||strcmp("int",str)==0||str
cmp("float",str)==0||strcmp("char",str)==0||strcmp("double",str)==0||strcmp("printf",str)==0||
strcmp("switch",str)==0||strcmp("case",str)==0)
printf("\n%s is a keyword",str);
else
printf("\n%s is an identifier",str);
}
void main()
{
FILE *f1,*f2,*f3;
char c,str[10],st1[10];
int num[100],lineno=0,tokenvalue=0,i=0,j=0,k=0;
f1=fopen("input","r");
f2=fopen("identifier","w");
f3=fopen("specialchar","w");
while((c=getc(f1))!=EOF)
{ if(isdigit(c))
 {
tokenvalue=c-'0';
 c=getc(f1);
 while(isdigit(c))
 {
tokenvalue*=10+c-'0';
 c=getc(f1);
 }
 num[i++]=tokenvalue;
ungetc(c,f1);
 }
 else
 if(isalpha(c))
{
putc(c,f2);
 c=getc(f1);
 while(isdigit(c)||isalpha(c)||c=='_'||c=='$')
 {
putc(c,f2);
 c=getc(f1);
 }
putc(' ',f2);
ungetc(c,f1);
 }
 else
if(c==' '||c=='\t')
printf(" ");
 else
 if(c=='\n')
lineno++;
 else
putc(c,f3);
}
fclose(f2);
fclose(f3);
fclose(f1);
printf("\n the no's in the program are:");
for(j=0;j<i;j++)
printf("\t%d",num[j]);
printf("\n");
f2=fopen("identifier","r");
k=0;
printf("the keywords and identifier are:");
while((c=getc(f2))!=EOF)
if(c!=' ')
str[k++]=c;
else {
 str[k]='\0';
 keyword(str);
 k=0;
}
fclose(f2);
f3=fopen("specialchar","r");
printf("\n Special Characters are");
while((c=getc(f3))!=EOF)
printf("\t%c",c);
printf("\n");
fclose(f3);
printf("Total no of lines are:%d",lineno);
}
 
 

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