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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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CC78K4 датащи(PDF) 267 Page - NEC |
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CC78K4 датащи(HTML) 267 Page - NEC |
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267 / 523 page  CHAPTER 10 LIBRARY FUNCTIONS User’s Manual U15556EJ1V0UM 267 7-35 frexpf Mathematical Functions FUNCTION frexpf finds the mantissa and exponent part. HEADER math.h FUNCTION PROTOTYPE float frexpf (float x, int *exp) ; Function Arguments Return Value frexpf x ... Numeric value to perform operation exp ... Pointer to store exponent part Normal ... Mantissa of x When x = NaN, x = ±∞ ... NaN When x = ±0 ... ±0 EXPLANATION • Divides a floating-point number x into mantissa m and exponent n such as x = m*2^n and returns mantissa m. • Exponent n is stored in where the pointer exp indicates. The absolute value of m, however, is 0.5 or more and less than 1.0. • If x is non-numeric, NaN is returned and the value of *exp is 0. • If x is ±∞, NaN is returned, and EDOM is set to errno with the value of *exp as 0. • If x is ±0, ±0 is returned and the value of *exp is 0. |
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