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HP-UX Reference > Sscalbln(3M)HP-UX 11i Version 3: February 2007 |
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NAMEscalbln(), scalblnf(), scalblnl(), scalblnq(), scalblnw() — scale exponent of a radix-independent floating-point number DESCRIPTIONThe scalbln() function returns x * rn, where r is the radix of the machine's floating-point arithmetic. When r is 2 (as it is on all PA-RISC and Integrity servers), scalbln() computes the same value as ldexp(). Integrity Servers Onlyscalblnf() is a float version of scalbln(); it takes a float first argument and returns a float result. scalblnl() is a long double version of scalbln(); it takes a long double first argument and returns a long double result. scalblnw() is an extended version of scalbln(); it takes an extended first argument and returns an extended result. scalblnq() is equivalent to scalblnl() on HP-UX systems. USAGETo use these functions compile either with the default -Ae option or with the -Aa and -D_HPUX_SOURCE options. To use scalblnw() or scalblnq(), compile also with the -fpwidetypes option. Make sure your program includes <math.h>. Link in the math library by specifying -lm on the compiler or linker command line. For more information, see the HP-UX floating-point guide for HP Integrity servers at the following site: http://www.hp.com/go/fp. RETURN VALUEscalbln(-x, n) and -scalbln(x, n) are equivalent. If x is ±INFINITY, zero, or a NaN, scalbln() returns x. scalbln() returns a properly signed infinity in lieu of a value whose magnitude is too large, and raises the overflow and inexact exceptions. scalbln() raises the underflow and inexact exceptions whenever a result is tiny (essentially denormal or zero) and thereby suffers loss of accuracy, and may raise those exceptions if the result is merely tiny. |
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