frexp() - Mathematical Function
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".
float frexp( float num, int *exp);
double frexp( double num, int *exp);
long double frexp( long double num, int *exp);
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".
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".
