#include <stdio.h>
#include <string.h>

void alphabreak( char in[], char out[])
{
 int i, len;
 char c;

 len = strlen( in );

 for (i = 0; i < len; i++)
 {
  c = in[i];
  if (c >= 'a' && c <= 'z')
  {
    switch (c) {
        case 'a':
            c = 'z';
            break;
        case 'b':
            c = 'y';
            break;
        case 'c':
            c = 'x';
            break;
        case 'd':
            c = 'w';
            break;
        case 'e':
            c = 'v';
            break;
        case 'f':
            c = 'u';
            break;
        case 'g':
            c = 't';
            break;
        case 'h':
            c = 's';
            break;
        case 'i':
            c = 'r';
            break;
        case 'j':
            c = 'q';
            break;
        case 'k':
            c = 'p';
            break;
        case 'l':
            c = 'o';
            break;
        case 'm':
            c = 'n';
            break;
        case 'n':
            c = 'm';
            break;
        case 'o':
            c = 'l';
            break;
        case 'p':
            c = 'k';
            break;
        case 'q':
            c = 'j';
            break;
        case 'r':
            c = 'i';
            break;
        case 's':
            c = 'h';
            break;
        case 't':
            c = 'g';
            break;
        case 'u':
            c = 'f';
            break;
        case 'v':
            c = 'e';
            break;
        case 'w':
            c = 'd';
            break;
        case 'x':
            c = 'c';
            break;
        case 'y':
            c = 'b';
            break;
        case 'z':
            c = 'a';
            break;
    }
  }
  out[i] = c;
  }

 out[len] = '\0';

}

void rotatebreak( char in[], char out[])
{
 int i, len;
 char c;

 len = strlen( in );

 for (i = 0; i < len; i++)
 {
  c = in[i];
  if (c >= '0' && c <= 'z')
  {
    if(c == 'z')
        c = 'a';
    else c = c + 1;
  }
  out[i] = c;
 }

 out[len] = '\0';

}

void rotatefix( char in[], char out[])
{
 int i, len;
 char c;

 len = strlen( in );

 for (i = 0; i < len; i++)
 {
  c = in[i];
  if (c >= '0' && c <= 'z')
  {
    if(c == 'a')
        c = 'z';
    else
        c = c;

  }
  out[i] = c;
 }

 out[len] = '\0';

}

void breakit( char in[], char out[])
{
 int i, len;
 char c;

 len = strlen( in );

 for (i = 0; i < len; i++)
 {
  c = in[i];
  if (c >= '0' && c <= 'z')
   c = c + 1;
  out[i] = c;
 }

 out[len] = '\0';

}

void fixit(char in[], char out[])
{
 int i, len;
 char c;

 len = strlen( in );

 for (i = 0; i < len; i++)
 {
  c = in[i];
  if (c >= '0' && c <= 'z'+1)
   c = c - 1;
  out[i] = c;
 }

 out[len] = '\0';

}

main()
{
 // declare strings

 char orig[25], mess[25], fix[25];
 char l;

 // read string from user

 printf("Enter a string peasant: ");
// scanf("%s", orig);
 fgets(orig, 25, stdin);
 l = strlen( orig );
 l--;
 orig[l] = '\0';

 breakit( orig, mess);

 printf("shift mixed: %s\n", mess);

 fixit(mess, fix);

 printf("shift fixed: %s\n", fix);

 rotatebreak (orig, mess);

 printf("Rotation mapping mixed: %s\n", mess);

 rotatefix (orig, fix);

 printf("Rotation mapping fixed: %s\n", fix);

 alphabreak (orig, mess);

 printf("Alpha replace mixed %s\n", mess);

 alphabreak (mess, fix);

 printf("Alpha replace fixed: %s\n", fix);

 return 0;
}