test.c

#include <stdio.h>
#include <ncurses.h>

int encrypt(int num);

int main()
{
  int num = 0;
  printf("Enter a positive fcku: ");
  scanf("%d", &num);
  printf("Enter 4 letters:\n");
  encrypt(num);
  encrypt(num);
  encrypt(num);
  encrypt(num);
  return 0;
}

int encrypt(int num)
{
  char letter = 'a', enc = 0;
  letter = getchar();
  enc = letter + num;
  return(enc);
}