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C++ exp2()

Last Updated on Wednesday 5th Oct 2022


The C++ exp2() function returns the base-2 exponential function. It is defined in the <cmath> header file.





The exp2() function takes a one argument which can be any value i.e. negative, positive or zero.

Return value

Returns the value in the range of [0, ∞].

If the magnitude of the result is too large to be represented by a value of the return type, the function returns HUGE_VAL (or HUGE_VALF or HUGE_VALL) with the proper sign, and an overflow range error occurs.

exp 2

exp2() prototype [As of C++ 11 standard]

					double exp2(double x);
float exp2(float x);
long double exp2(long double x);
double exp2(T x); // For integral type


Example 1 : C++ exp2()

					#include <stdio.h>
#include <math.h>

int main () {
  double param, result;
  param = 4.0;
  result = exp2(param);
  printf ("2 ^ %f = %f.\n", param, result );
  return 0;



					2 ^ 4.000000 = 16.000000.


exp 2 2

Example 2 : C++ exp2()

					#include <iostream>
#include <cmath>
using namespace std;

int main() {
    long int x = 11;
    double result;
    result = exp2(x);
    cout << "exp2(x) = " << result << endl;
    return 0;



					exp2(x) = 2048