ldexp() - Mathematical Function
How is Mathematical Function "ldexp()" used in C++?
How to generate number from mantissa and exponent?
Explanation
ldexp() is a Mathematical Function that returns the resulting floating point value from multiplying the mantissa (x) by 2 raised to the power of exponent(exp).(i.e) It returns the value of "num * 2exp ". If an overflow occurs "HUGE_VAL" is returned.
float ldexp( float num, int exp);
double ldexp( double num, int exp);
long double ldexp( long double num, int exp);
Result :
8.000000 times of 2 to the power of 4 is:: 128.000000
In the above example ldexp() returns the value of "8*24".Thus a floating point number is generated from the mantissa(8.0) and exponent(4).
Syntax:
float ldexp( float num, int exp);
double ldexp( double num, int exp);
long double ldexp( long double num, int exp);
Example :
| #include <stdio.h> #include <math.h> int main() { double num, r; int exp=4; num = 8.0; r = ldexp( num, exp); printf( "%lf times of 2 to the power of %d is:: %lf\n", num,exp, r); return 0; } |
Result :
8.000000 times of 2 to the power of 4 is:: 128.000000
In the above example ldexp() returns the value of "8*24".Thus a floating point number is generated from the mantissa(8.0) and exponent(4).
