To find the given sting is palindrome or circular palindrome or not a palindrome

#include<stdio.h>

#include<conio.h>

int first,last,len,palindrome=0,true,flag=0;

char s[100];

// TO CHECK WHETHER THE GIVEN STRING IS PALINDROME 

int ispal(){

last=len-1;

for(first=0;first<len/2;first++){

if(s[first]!=s[last--]){

return 0;

}

}

return 1;

}

// TO CHECK WHETHER THE GIVEN STRING IS CIRCULAR PALINDROME

int pal(int f,int l){

int count=0;

for(;count<len;){

if(f==len) // IF FIRST REACHES THE LAST CHARACTER OF THE             f=0;          STRING..

if(l==-1)  // IF LAST REACHES THE FIRST CHARACTER OF THE

l=len-1;      STRING

if(s[f++]!=s[l--]){

return 0;

}

count++;

}

return 1;

}

//TO PRINT THE CIRCULAR PALINDROME STRING

void print(int ii){

int k;

for(k=0;k<len;k++){

if(ii==len)

ii=0;

printf("%c",s[ii++]);

}

}

//DRIVER PROGRAM

void main(){

int i,j;

clrscr();

scanf("%s",s);

for(len=0;s[len]!='\0';len++);

palindrome=ispal();

if(palindrome==1){

printf("palindrome");

}

else{

j=0;

for(i=1;i<len&&true==0;i++,j++){

true=pal(i,j);

if(true==1){

first=i;

last=j;

flag=1;

}

}

if(flag==1){

printf("%s is a circular palindrome of ",s);

print(first);

}

else

printf("\nNot palindrome");

}

getch();

}