Binary numbers - to be used in the Computer
Before we take a look at the binary numbers throw, read our article on the topic of "binary and hexadecimal numbers" in which we explain how these right be converted.
- The Computer uses a number system of ones and zeros. Data can be stored with this number system, for example, in the Form of an electrical charge on a capacitor, in the Form of an electrical voltage to a resistance or magnetization, for example, hard disk drives ("HDD").
- All the Figures represent Computer by using the dual system. Other types of numbers, such as floating-point numbers or negative values, each with its own conventions to depict.
- A little more complicated, the Whole is, however, in the case of letters and punctuation. For this purpose, a special encoding is required.
ASCII table with hexadecimal numbers
ASCII letters - so they can be used
Nowadays, there are many different encodings. The best-known encoding is ASCII, the "American Standard Code for information interchange".
- The ASCII Code includes the Roman Alphabet in Uppercase and lowercase letters, the ten Arabic numerals and some punctuation marks (punctuation marks, word marks), other special characters and some control characters.
- In ASCII Code each character is assigned a Bit pattern of 7 bits. The ASCII not used, the eighth Bit can be used for error correction purposes (parity bit) on the communication lines, or for other control tasks. An ASCII Character thus consumes a storage space of 8 Bits, i.e. one Byte.
- The first 32 ASCII character codes (from 0x00 to 0x1F) are reserved for control characters. From this point on, all other characters can also be used for visible purposes.
- In the ASCII code, you only have to remember one important number: 64. In the dual system, the number (1000000)it would be₂, and in the hexadecimal system, the number 0x40. This number corresponds to the ASCII Code for the @character. Then the big "A", then the big "B", and so forth. The big "A" has the value 65, the big "B" has the value 66, and so on.
- Lowercase letters start at 97. In fact, 97 (in decimal system), the small "a". Numbers start again at 48. The (Decimal)value 48 is a 0.
- Pro-tip: Enable the number pad of your keyboard. You hold the key [Alt] pressed and enter the Pay Code for an ASCII Character in the number block. As soon as you release the [Alt] key, the respective character. Previously you should, however, be a word processing program open. Control characters such as BS or TAB are not displayed as characters.
General ASCII table
In the next tip we will explain how quantum computers work.
