barcode check digit excel formula Related Function toupper( ) toupper in Software

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Related Function toupper( ) toupper
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#include <ctypeh> int toupper(int ch);
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The toupper( ) function returns the uppercase equivalent of ch if ch is a letter; otherwise ch is returned unchanged Example This code displays A:
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putchar(toupper('a'));
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Related Function tolower( )
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15 Mathematical Functions
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C99 has greatly increased the size of the C mathematical library The C89 standard defined just 22 mathematical functions C99 has more than tripled this number Expanding the usability of C for numeric processing was one of the primary goals of the C99 committee It is safe to say that they succeeded! All the math functions require the header <mathh> In addition to declaring the math functions, this header defines one or more macros For C89, the only macro defined by <mathh> is HUGE_VAL, which is a double value indicating that an overflow has occurred C99 defines several more, including HUGE_VALF HUGE_VALL INFINITY math_errhandling A float version of HUGE_VAL A long double version of HUGE_VAL A value representing infinity Contains either MATH_ERRNO and/or MATH_ERREXCEPT erno used to report errors Floating-point exception raised to report errors Not a number
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MATH_ERRNO MATH_ERREXCEPT NAN
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C99 defines several function-like macros that classify a value They are shown here int fpclassify(fpval) Returns FP_INFINITE, FP_NAN, FP_NORMAL , FP_SUBNORMAL , or FP_ZERO, depending upon the value in fpval These macros are defined by <mathh> Returns nonzero if fpval is finite Returns nonzero if fpval is infinite Returns nonzero if fpval is not a number Returns nonzero if fpval is a normal value Returns nonzero if fpval is negative (that is, its sign bit is set)
int isfinite(fpval) int isinf(fpval) int isnan(fpval) int isnormal(fpval) int signbit(fpval)
C99 defines the following comparison macros For each, a and b must be floating-point types
int isgreater(a, b)
Returns nonzero if a is greater than b
int isgreaterequal(a, b) int isless(a, b)
Returns nonzero if a is greater than or equal to b Returns nonzero if a is less than b
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int islessequal(a, b) int islessgreater(a, b) int isunordered(a, b)
Returns nonzero if a is less than or equal to b Returns nonzero if a is greater than or less than b Returns 1 if a and b are unordered relative to each other; zero is returned if a and b are ordered
The reason for these macros is that they gracefully handle values that are not numbers, without causing a floating-point exception The macros EDOM and ERANGE are also used by the math functions These macros are defined in the header <errnoh> C89 and C99 handle errors somewhat differently For C89, if an argument to a math function is not in the domain for which it is defined, an implementation-defined value is returned, and the built-in global integer variable errno is set equal to EDOM For C99, a domain error also causes an implementation-defined value to be returned However, the value of math_errhandling determines what other actions take place If math_errhandling contains MATH_ERRNO, then the built-in global integer variable errno is set equal to EDOM If math_errhandling contains MATH_ERREXCEPT, a floating-point exception is raised For C89, if a function produces a result that is too large to be represented, an overflow occurs This causes the function to return HUGE_VAL, and errno is set to ERANGE , indicating a range error If an underflow happens, the function returns zero and sets errno to ERANGE For C99, an overflow error also causes the function to return HUGE_VAL, and an underflow also causes the function to return zero Then, if math_errhandling contains MATH_ERRNO, errno is set to ERANGE, indicating a range error If math_errhandling contains MATH_ERREXCEPT, a floating-point exception is raised In C89, the mathematical functions are specified as operating on values of type double, and returning double values C99 added float and long double versions of these functions, which use the f and 1 suffixes, respectively For example, C89 defines sin( ) as shown here: double sin(double arg); C99 keeps sin( ) and adds sinf( ) and sinl( ), shown next float sinf(float arg); long double sinl(long double arg); The operation of all three functions is the same except for the data upon which they operate The addition of the f and 1 math functions allows you to use the version that precisely fits the data upon which you are operating
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