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frexp() - Mathematical Function


Tutorials Cpp

Topic

How is Mathematical Function "frexp()" used in C++?
How to Get Mantissa and exponent of a number using c++?



Explanation

frexp() is a Mathematical Function that converts a number into a mantissa in the range 0.5 to less than 1 and an integer exponent such that num=matissa * 2exp. The mantissa is returned by the function and the exponent is stored in the variable pointed by the "exp".

Syntax to get Mantissa and Exponent:
    float frexp( float num, int *exp);
    double frexp( double num, int *exp);
    long double frexp( long double num, int *exp);

Example:

   #include <stdio.h>
   #include <math.h>
   int main()
     {
        double num, r;
        int exp;
        num = 6.0;
        r = frexp( num, &exp);
        printf("The matissa returned is::%lf",r);
        printf("The exponent value stored in exp is::%d",exp);
        return 0;
     }

Result:
    The matissa returned is::0.750000
    The exponent value stored in exp is::3

In the above example frexp() is used to get the mantissa value and the exponenet value is stored in the "exp".










Note
C++ is one of the most used programming languages in the world. Also known as "C with Classes". Hope you enjoy this tutorial. Do send your feedback or suggestions on this C++ tutorial. This is a copyright content.

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