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std::modf

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< cpp‎ | numeric‎ | math

 
 
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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 );
Se décompose donné flottant x valeur du point en parties intégraux et fractionnaires, chacun ayant le même type et le signe que x. La partie intégrante (en virgule flottante) sont stockées dans l'objet pointé par 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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Sommaire

[modifier] Paramètres

arg -
valeur du point flottant
Original:
floating point value
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iptr -
pointeur sur valeur du point flottant pour stocker la partie intégrante de la
Original:
pointer to floating point value to store the integral part to
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[modifier] Retourne la valeur

La partie fractionnaire de x avec le même signe que x. La partie intégrante est placée dans la valeur pointée par 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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[modifier] Exemple

#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';
}

Résultat :

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

[modifier] Voir aussi

(C++11)
entier le plus proche n'est pas supérieure en grandeur à la valeur donnée
Original:
nearest integer not greater in magnitude than the given value
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(fonction) [edit]