Instructions

Think of a number from 1 to 31.  And then answer the questions:

• Is your number in GRID 'A'?
• Is your number in GRID 'B'?
• Is your number in GRID 'C'?
• Is your number in GRID 'D'?
• Is your number in GRID 'E'?

And vCalc will magically (i.e. mathematically) tell you the number.

Thanks to Chuck Trautwein for this fun little exercise in binary numbers.

The Math / Science

While it may seem like Mind Reading or Magic, it's just math, specifically binary math. If you have, five yes/no bits represented as zeroes and ones, you can use those bits to specify a base 10 number (what we use every day) from 1 to 31.  Look at the list below.  Do you see patterns?  This is exactly how a computer represents numbers.  The cards above each list the numbers that have the bits 1 through five listed.

1. 0,0,0,0,1
2. 0,0,0,1,0
3. 0,0,0,1,1
4. 0,0,1,0,0
5. 0,0,1,0,1
6. 0,0,1,1,0
7. 0,0,1,1,1
8. 0,1,0,0,0
9. 0,1,0,0,1
10. 0,1,0,1,0
11. 0,1,0,1,1
12. 0,1,1,0,0
13. 0,1,1,0,1
14. 0,1,1,1,0
15. 0,1,1,1,1
16. 1,0,0,0,0
17. 1,0,0,0,1
18. 1,0,0,1,0
19. 1,0,0,1,1
20. 1,0,1,0,0
21. 1,0,1,0,1
22. 1,0,1,1,0
23. 1,0,1,1,1
24. 1,1,0,0,0
25. 1,1,0,0,1
26. 1,1,0,1,0
27. 1,1,0,1,1
28. 1,1,1,0,0
29. 1,1,1,0,1
30. 1,1,1,1,0
31. 1,1,1,1,1

Computer Science Calculators

• Convert Integer to Binary
• Convert Binary to Integer
• Convert Integer to Octal
• Convert Integer to Hex
• Convert Binary to Hex
• Convert Binary to Octal
• Convert Hex to Decimal
• Convert Hex to Octal
• Convert Octal to Decimal
• Convert Octal to Binary
• Convert Octal to Hex
• Pick a Number between 1 and 31 (binary game)
• Character to Unicode
• Binary Math
• Octal Math
• Hex Math
• Cyclomatic Complexity

String Manipulation Equations:

• String Compare
• Palindrome Check
• Reverse String
• Remove Vowels/Consonants/Numbers/Whitespace
• String to Comma-Separated List
• Word Count
• Character Count
• Regex Remove
• Caesar Cipher Encrypt
• Caesar Cipher Decrypt