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  2. C syntax - Wikipedia

    en.wikipedia.org/wiki/C_syntax

    A snippet of C code which prints "Hello, World!". The syntax of the C programming language is the set of rules governing writing of software in C. It is designed to allow for programs that are extremely terse, have a close relationship with the resulting object code, and yet provide relatively high-level data abstraction.

  3. List of Mersenne primes and perfect numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_Mersenne_primes...

    Visualization of 6 as a perfect number Logarithmic graph of the number of digits of the largest known prime number by year, nearly all of which have been Mersenne primes. Mersenne primes and perfect numbers are two deeply interlinked types of natural numbers in number theory.

  4. Perfect number - Wikipedia

    en.wikipedia.org/wiki/Perfect_number

    In number theory, a perfect number is a positive integer that is equal to the sum of its positive proper divisors, that is, divisors excluding the number itself. [1] For instance, 6 has proper divisors 1, 2 and 3, and 1 + 2 + 3 = 6, so 6 is a perfect number. The next perfect number is 28, since 1 + 2 + 4 + 7 + 14 = 28.

  5. Operators in C and C++ - Wikipedia

    en.wikipedia.org/wiki/Operators_in_C_and_C++

    This is a list of operators in the C and C++ programming languages.. All listed operators are in C++ and lacking indication otherwise, in C as well. Some tables include a "In C" column that indicates whether an operator is also in C. Note that C does not support operator overloading.

  6. C (programming language) - Wikipedia

    en.wikipedia.org/wiki/C_(programming_language)

    This is an accepted version of this page This is the latest accepted revision, reviewed on 25 February 2025. General-purpose programming language "C programming language" redirects here. For the book, see The C Programming Language. Not to be confused with C++ or C#. C Logotype used on the cover of the first edition of The C Programming Language Paradigm Multi-paradigm: imperative (procedural ...

  7. List of knitting stitches - Wikipedia

    en.wikipedia.org/wiki/List_of_knitting_stitches

    Crossed stitch [5] Herringbone stitch [6] Linen stitch is a pattern that creates a tightly knit fabric that resembles woven linen. Tailored garments are especially suited for the linen stitch. It is a durable stitch, and is often used to reinforce the heels of hand-knitted socks. It includes knit and purl stitches, as well as slipped stitches. [7]

  8. Hamming bound - Wikipedia

    en.wikipedia.org/wiki/Hamming_bound

    A perfect code may be interpreted as one in which the balls of Hamming radius t centered on codewords exactly fill out the space (t is the covering radius = packing radius). A quasi-perfect code is one in which the balls of Hamming radius t centered on codewords are disjoint and the balls of radius t+1 cover the space, possibly with some ...

  9. Knitting abbreviations - Wikipedia

    en.wikipedia.org/wiki/Knitting_abbreviations

    Slip 2 stitches together, knit one stitch, pass the slipped stitches over (together). cddp: Centre double decrease purl. cdi: center double increase. ch: Chain using crochet hook. cn: Cable needle. CO: Cast on. cont: Continue. C 2 L: Cross two stitches to the left. C 2 R: Cross two stitches to the right. C2PL: Cross two, purl left.