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c51头函数(国外英语资料)
c51头函数(国外英语资料)
Character processing function
This category function is used to handle individual characters, including character class testing and character case conversion
Header file ctype.h
Function list
Function classes, functions, uses, details
Character tests for letters and numbers isalnum
Does the letter isalpha?
Do you want to control the character iscntrl?
Is the number isDigit?
Is it possible to display characters (except for space extra) isgraph
Is it possible to display characters (including spaces) isprint
Whether it is a blank, not letter and numeric display character ispunct
Is the space isspace?
Do you have capital letters isupper?
Whether 16 hexadecimal numbers (0-9, A-F) character isxdigit
The character case conversion function is converted to uppercase toupper
Convert to lowercase letter tolower
Regionalization
Functions of this class are used to handle language differences in different countries.
Header file local.h
Function list
Function classes, functions, uses, details
Area control area set up setlocale
Digital format convention query country currency, date, time format conversion localeconv
Mathematical function
This classification gives various mathematical calculations, and it must be reminded that the data format in the C ANSI standard does not conform to the IEEE754 standard, and some C language compilers follow IEEE754 (for example, frinklin, C51)
Header file math.h
Function list
Function classes, functions, uses, details
Error condition processing defines domain errors (the input parameter value of the function is not within the specified range)
Range error (the return value of the function is not within the specified range)
Trigonometric inverse cosine ACOs
Inverse sine asin
Arc tangent atan
Cut 2 atan2 anyway
Cosine cos
Sinusoidal sin
Tangent Tan
Hyperbolic function, hyperbolic cosine, cosh
Hyperbolic sine Sinh
Hyperbolic tangent tanh
Exponential and logarithmic exponential functions, exp
Exponential decomposition function frexp
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