C++ cypher problem with shifting an array

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C++

hi im having trouble with a cypher program which asks the user to input a shift number then that number shifts an alphabet array so it is encrypted please help
p.s i cant use headers

#include <iostream>

using namespace std;


int getlength(char[]);
char makecypher(int);

int main(void) {

	 int shift;
	int length = 0;
	char inputarray[256];
	char array[] = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't','u', 'v', 'w', 'x','y', 'z' } ;



	cout << " Please input a string: ";
	cin.getline ( inputarray,256);

	// for loop to get lower case chars
	for(int i = 0; inputarray[i] != 0; i++)
	{
		if(inputarray[i] >= 'A' && inputarray[i] <= 'Z')
		{
			inputarray[i] += 32;
		}

		length++;
	}

	// removes spaces and non alphabetic chars
	for(int j = 0; inputarray[j] != 0;	 j++)
	{
		if ((inputarray[j] < 97) || (inputarray[j] > 122))
		{
			int remove = 1;
			for(int k = 0; k < length; k++)
			{
				inputarray[j+k] = inputarray[j+remove];
				remove++;
			}

			j--;
		}
		
	}
		
	



	cout << "You input: \n" << inputarray <<"\n";
	cout << " The length of the string is:  " << getlength(inputarray);
	cout << "\n";
	cout << " please enter the shift value:  ";
	cin  >> shift;
	cout << " the alpha :   " << makecypher(shift);



	

     

	cin.ignore(3);
}


int getlength(char inputarray[])
{
	int charlength = 0;

while((*inputarray) != '\0')

{
	 charlength++;
	 inputarray++;
}


return charlength;
	
}



char makecypher( int shift )

{
	char alphaarray[] = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 
               'n', 'o', 'p', 'q', 'r', 's', 't','u', 'v', 'w', 'x','y', 'z' } ;
	char cipherarray[27];

int i = 0;
static int shift;

for (int z = 0; z < 26; z++) // For Loop to adjust shift value
{
      // If statement condition to check whether the shift value is less than 26
      if (z < 26)
      {
      // Then shift and replace the element in the array
      cipherarray[z] = alphaarray[shift];

     i++; // Increment i to get the next character in the array
     }
}	

}

void encrypt ()

{
}