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ldexp() Function with Example in C++
C++ ldexp() function: Here, we are going to learn about the ldexp() function with example of cmath header in C++ programming language?
Submitted by IncludeHelp, on May 18, 2020
C++ ldexp() function
ldexp() function is a library function of cmath header, it is used to calculate the value from significand and exponent, it returns the multiplication of significand and 2 raised to the power of the exponent. It accepts two values (significand and exponent) and returns the result of significand x 2^exponent.
Syntax
Syntax of ldexp() function:
C++11:
double ldexp (double significand, int exponent);
float ldexp (float significand, int exponent);
long double ldexp (long double significand, int exponent);
double ldexp (T significand, int exponent);
Parameter(s)
- significand, exponent – represent the values to calculate the result from significand and exponent.
Return value
It returns the multiplication of significand and 2 raised to the power of the exponent.
Sample Input and Output
Input:
float s = 10.0f;
float y = 2.0f
Function call:
ldexp(x, y);
Output:
40 (10.0 * 2.0^2.0 = 10.0 * 4.0 = 40)
Example
C++ code to demonstrate the example of ldexp() function:
// C++ code to demonstrate the example of
// ldexp() function
#include <iostream>
#include <cmath>
using namespace std;
int main()
{
float s = 10.0f;
float e = 2.0f;
cout << "ldexp(" << s << "," << e << ") = " << ldexp(s, e) << endl;
s = 20.0f;
e = 0.0f;
cout << "ldexp(" << s << "," << e << ") = " << ldexp(s, e) << endl;
s = 36.2f;
e = 0.49f;
cout << "ldexp(" << s << "," << e << ") = " << ldexp(s, e) << endl;
return 0;
}
Output
ldexp(10,2) = 40
ldexp(20,0) = 20
ldexp(36.2,0.49) = 36.2
Reference: C++ ldexp() function