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std::modf

Da cppreference.com.
< cpp‎ | numeric‎ | math

 
 
Numeri libreria
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Generic numeric operations
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Defined in header <cmath>
float       modf( float x, float* iptr );
double      modf( double x, double* iptr );
long double modf( long double x, long double* iptr );
Si decompone in virgola mobile x valore del punto in parti integrali e frazionarie, ciascuno con lo stesso tipo e segno come x. La parte integrale (in formato di virgola mobile) viene memorizzato nell'oggetto puntato da iptr.
Original:
Decomposes given floating point value x into integral and fractional parts, each having the same type and sign as x. The integral part (in floating-point format) is stored in the object pointed to by iptr.
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Indice

[modifica] Parametri

arg -
valore in virgola mobile
Original:
floating point value
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iptr -
puntatore al valore in virgola mobile per memorizzare la parte integrante
Original:
pointer to floating point value to store the integral part to
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[modifica] Valore di ritorno

La parte frazionaria del x con lo stesso segno x. La parte integrale viene messa in valore puntato da iptr.
Original:
The fractional part of x with the same sign as x. The integral part is put into the value pointed to by iptr.
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[modifica] Esempio

#include <iostream>
#include <cmath>
int main()
{
    double f = 123.45;
    double f3;
    double f2 = std::modf(f, &f3);
    std::cout << "Given the number " << f  << ", "
              << "modf() makes " << f3 << " and " << f2 << '\n';
 
    f = -3.21;
    f2 = std::modf(f, &f3);
    std::cout << "Given the number " << f  << ", "
              << "modf() makes " << f3 << " and " << f2 << '\n';
}

Output:

Given the number 123.45, modf() makes 123 and 0.45
Given the number -3.21, modf() makes -3 and -0.21

[modifica] Vedi anche

(C++11)
intera più vicina non superiore in grandezza rispetto al valore dato
Original:
nearest integer not greater in magnitude than the given value
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(funzione) [edit]