Vowel whose quality does not change over the duration of the vowel is called a monophthong. Monophthongs are sometimes called "pure" or "stable" vowels. A vowel sound that glides from one quality to another is called a diphthong, and a vowel sound that glides successively through three qualities is a triphthong. All languages have monophthongs and many languages have diphthongs, but triphthongs or vowel sounds with even more target qualities are relatively rare cross-linguistically. English has all three types: the vowel sound in "hit" is a monophthong , the vowel sound in "boy" is in most dialects a diphthong , and
C data types also are available at codice_45 header (codice_46 header in C++). The types can be grouped into the following categories: The following table summarizes the types and the interface to acquire the implementation details (N refers to the number of bits): The codice_113 header (codice_114 header in C++) provides features that enhance the functionality of the types defined in codice_45 header. Included are macros that define printf format string and scanf format string specifiers corresponding to the codice_45 types and several functions for working with codice_121 and codice_122 types. This header was added in C99. The macros are in the format