Problem: Older operating systems such as TOPS-10, along with CP/M, tracked file length only in units of disk blocks and used Control-Z (SUB) to mark the end of the actual text in the file. For this reason, EOF, or end-of-file, was used colloquially and conventionally as a three-letter acronym for Control-Z instead of SUBstitute. The end-of-text code (ETX), also known as Control-C, was inappropriate for a variety of reasons, while using Z as the control code to end a file is analogous to it ending the alphabet and serves as a very convenient mnemonic aid. A historically common and still prevalent convention uses the ETX code convention to interrupt and halt a program via an input data stream, usually from a keyboard.
What is still the conventional use of the ETX code?
The answer is the following: to interrupt and halt a program via an input data stream, usually from a keyboard

Problem: In the 1960 election to choose his successor, Eisenhower endorsed his own Vice President, Republican Richard Nixon against Democrat John F. Kennedy. He told friends, "I will do almost anything to avoid turning my chair and country over to Kennedy." He actively campaigned for Nixon in the final days, although he may have done Nixon some harm. When asked by reporters at the end of a televised press conference to list one of Nixon's policy ideas he had adopted, Eisenhower joked, "If you give me a week, I might think of one. I don't remember." Kennedy's campaign used the quote in one of its campaign commercials. Nixon narrowly lost to Kennedy. Eisenhower, who was the oldest president in history at that time (then 70), was succeeded by the youngest elected president, as Kennedy was 43.
Who was the youngest person elected to the United States presidency?
The answer is the following: Kennedy

Problem: The simplest type of MP3 file uses one bit rate for the entire file: this is known as Constant Bit Rate (CBR) encoding. Using a constant bit rate makes encoding simpler and faster. However, it is also possible to create files where the bit rate changes throughout the file. These are known as Variable Bit Rate (VBR) files. The idea behind this is that, in any piece of audio, some parts will be much easier to compress, such as silence or music containing only a few instruments, while others will be more difficult to compress. So, the overall quality of the file may be increased by using a lower bit rate for the less complex passages and a higher one for the more complex parts. With some encoders, it is possible to specify a given quality, and the encoder will vary the bit rate accordingly. Users who know a particular "quality setting" that is transparent to their ears can use this value when encoding all of their music, and generally speaking not need to worry about performing personal listening tests on each piece of music to determine the correct bit rate.
How many bit rates does the simplest type of MP3 file use?
The answer is the following: one

Problem: In the eight precepts, the third precept on sexual misconduct is made more strict, and becomes a precept of celibacy. The three additional precepts are:
Of the eight precepts which one is on sexual misconduct?
The answer is the following:
third