ASCII 81
ASCII 81 is Capital letter Q, written Q.
Every representation
| Character | Q |
| Name | Capital letter Q |
| Decimal | 81 |
| Hexadecimal | 0x51 |
| Octal | 0121 |
| Binary | 01010001 |
| HTML entity | Q |
| Escape sequence | \x51 |
| Unicode | U+0051 |
| Group | Letter |
What it is for
The capital letter Q. Capitals run from 65 to 90 and their lowercase counterparts from 97 to 122, exactly 32 apart, so changing case is a single bit flip.
Where the number comes from
The alphabet was placed so that capitals start at 65 and lowercase at 97 — exactly 32 apart, a single bit. Changing case is therefore c ^ 32, and this was a deliberate design decision rather than a coincidence.
Frequently asked questions
What is ASCII 81?
Capital letter Q, the character Q. In hexadecimal it is 0x51, in octal 0121, and in binary 01010001.
How do I type ASCII 81?
Type Q directly. In a string literal it can also be written \\x51, and in HTML as Q.
Is ASCII 81 printable?
Yes. Codes 32 to 126 are the printable range, which is every character ASCII can actually display.
Nearby codes
- ASCII 74 — J
- ASCII 75 — K
- ASCII 76 — L
- ASCII 77 — M
- ASCII 78 — N
- ASCII 79 — O
- ASCII 80 — P
- ASCII 82 — R
- ASCII 83 — S
- ASCII 84 — T
- ASCII 85 — U
- ASCII 86 — V
- ASCII 87 — W
- ASCII 88 — X
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