This is what I have to code.
Input an array of numbers(any numbers that user inputs from standard input, aka keyboard), remove numbers from array that are not 0 and 1. Thay array should now be bitwise moved with << or >> (again user choses the number of spaces moved and a type of move). After all of that turn that array into a binary number. Max number of elements is defined as a header with #define max_num_el 255.

I have issues with part of code that need me to move elements of array and turning an array into binary number.

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#define max_br_el 255
void main (){
int p,k,j,n,i,temp,r;
unsigned long a[max_br_el], b[max_br_el];
while(1){
printf("\nEnter number of array elements (between 1 i 255)\n");
scanf("%d", &n);
if(n>0 && n<=max_br_el){
for(i=0 ; i<n ; i++){
printf("Enter %d. elements of array\n", i);
scanf("%d.", &a[i]);
}
/* Removing nums not 0 and 1 */
for(i=0 , k=0 ; i<n ; i++){
if(a[i] == 0 || a[i] == 1){
a[k] = a[i];
k++;
}
}
n=k;
for(k=0 ; k<n ; k++){
printf("%d\t" , a[k]);
}
/* My try on moving elements manualy (it has to be done with << and >> but I don't know how. Whenever I try to use << and >> I get element_of_array*2^n (where and n is number of spaces that needs to be moved. */
printf("\n");
printf("\nEnter for how many spaces you want to move\n");
scanf("%d", &p);
for(r=0 ; r<n; r++){
b[r] = a[k-p];
}
printf("\n");
for(r=0 ; r<n ; r++){
printf("%d" , b[r]);
}
}
else{
exit(1);
}
}
}

/* This is code so far. I still don't have part about binary conversion made, because I have bigger issues with << and >>. Here I tryed implementing manual moving of elements of array but it didn't work. Thanks for help. */

Hello,
I'm hoping for some help with a regex that has me stumped. My skill with regex is rather rudimentary.
To start, here are a couple of example URLs, and ...