title: convert char to char such as encryption
body: <p>How to make a simple encryption decryption?<br>
  2 pieces of make edit box and a button in the project, 
  then I write something in <code>editbox1</code> and then press <code>button1</code> in <code>editbox2</code> generate some keys in such settings .. </p>
  
  <blockquote>
    <p>a: = 1;  b: = 2;  c: = 3;  d: = 4;  e: = 5;  f: = 6;  g: = 7;  h: = 8;
    i: = 9;  j: = 0;  k: = #;  l: = $;  m: =%;  n: = ~;  o: = *;</p>
  </blockquote>
  
  <p>and then with the symbol say<br>
  <code>a: = 1;</code> it means: <code>a is 1 if at editbox2</code></p>
  
  <p>letters (A) be the number 1 subparagraph (B) be the number 2 subparagraph (C) be the number 3 simple conversion .. <strong>so make a simple substitution cipher and decryption</strong></p>