80 C Trivia Questions with Answers

80 public questions with answers, drawn from the well. How many can you answer?

Easy Easy difficulty.
C

In music, what is the key signature for C major?

Answer

No sharps or flats

Easy Easy difficulty.
C

What is the chemical formula for carbon monoxide?

Answer

CO

Hard Hard difficulty.
C

Which C standard introduced variable-length arrays?

Answer

C99

Hard Hard difficulty.
C

In C, what is the result of the expression 0 || 1 && 0?

Answer

0

Intermediate Intermediate difficulty.
C

What does the acronym GCC originally stand for in the context of C programming?

Answer

GNU C Compiler

Intermediate Intermediate difficulty.
C

In the C programming language, what is the name of the standard library header for string functions?

Answer

string.h

Intermediate Intermediate difficulty.
C

What is the name of the carbon isotope used in radiocarbon dating?

Answer

Carbon-14

Intermediate Intermediate difficulty.
C

In music, what clef places middle C on the third line?

Answer

Alto clef

Intermediate Intermediate difficulty.
C

In the C programming language, what keyword defines a constant?

Answer

const

Intermediate Intermediate difficulty.
C

What is the frequency of C5 (one octave above middle C) in equal temperament?

Answer

523.25 Hz

Easy Easy difficulty.
C

In music, what is the name of the chord consisting of C, E, and G?

Answer

C major chord

Easy Easy difficulty.
C

What is the hardest naturally occurring carbon allotrope?

Answer

Diamond

Easy Easy difficulty.
C

What is the size of a char in the C programming language according to the standard?

Answer

1 byte

Easy Easy difficulty.
C

What is the chemical element with atomic number 6?

Answer

Carbon

Easy Easy difficulty.
C

What is the SI unit of temperature with symbol °C?

Answer

Celsius

Hard Hard difficulty.
C

In C, what preprocessor operator converts a macro parameter to a string literal?

Answer

#

Hard Hard difficulty.
C

What is the name of the seminal book by Kernighan and Ritchie that defined the C language?

Answer

The C Programming Language

Hard Hard difficulty.
C

In C, what keyword declares a variable for fast access in a register?

Answer

register

Hard Hard difficulty.
C

What is the approximate frequency of middle C (C4) in hertz under standard tuning?

Answer

261.626 Hz

Intermediate Intermediate difficulty.
C

In C, what function is used to dynamically allocate memory?

Answer

malloc

Intermediate Intermediate difficulty.
C

In C, what is the result of integer division of 5 by 2?

Answer

2

Intermediate Intermediate difficulty.
C

What is the name of the C standard published in 2011?

Answer

C11

Intermediate Intermediate difficulty.
C

In C, which header file contains the printf and scanf functions?

Answer

stdio.h

Intermediate Intermediate difficulty.
C

What year was the C programming language first developed?

Answer

1972

Intermediate Intermediate difficulty.
C

What is the exact speed of light in vacuum in meters per second?

Answer

299,792,458

Easy Easy difficulty.
C

In the C programming language, which function prints formatted output to the screen?

Answer

printf

Easy Easy difficulty.
C

In music, what note is one semitone above B?

Answer

C

Easy Easy difficulty.
C

What is the third letter of the English alphabet?

Answer

C

Easy Easy difficulty.
C

What is the Roman numeral for 100?

Answer

C

Easy Easy difficulty.
C

What is the chemical symbol for carbon?

Answer

C