Fibonacci Series, Prime Fibonacci Numbers

#include<stdio.h>
#include<conio.h>

void fibonacci ( int );
void primefibo ( int );


void main()
{
  int n;
  printf("\n No. of Terms?:: ");
  scanf("%d",&n);
  fibonacci(n);
  printf("\n");
  primefibo(n);
}


// Function for displaying Fibonacci Series

void fibonacci(int n)
{
 int i=2,t0=0,t1=1,tn=1;
 printf("\n SERIES :: ");
 printf("%d  ",t0);
 while(i<n)
 {
  printf("%d  ",tn);
  tn=t0+t1;
  t0=t1;
  t1=tn;
  i++;
 }
 printf("%d",tn);
}


// Function for displaying Prime Numbers from Fibonacci Series

void primefibo ( int n )
{
 int i=2,t0=0,t1=1,tn=1;
 printf("\n Prime No. in SERIES :: ");
 while(i<n)
 {
  if(isprime(tn))
     printf("%d  ",tn);
  tn=t0+t1;
  t0=t1;
  t1=tn;
  i++;
 }
 if(isprime(tn))
    printf("%d",tn);
}



// Function to check a number whether it is Prime or not

int isprime( int n)
{
 int i;
 if(i<=1)
   return 0;
 for(i=2;i<n/2;i++)
  if(!(n%i))
   return 0;
 return 1;
}

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