Math code snippet to calculate (integer) X to the power of (integer) Y. IntPower is the integer variant of std::pow.


#include <cassert>



//From http://www.richelbilderbeek.nl/CppIntPower.htm

int IntPower(const int base, const int exponent)

{

  assert(exponent != 0

    && "When calculating IntPower(x,0) the result might be zero or one, depending on the context");

  assert(exponent > 0);



  int result = base;

  for (int i=1; i!=exponent; ++i)

  {

    result*=base;

  }

  return result;

}

IntPower test


#include <iostream>



int main()

{

  assert(IntPower(0,1)==0);

  assert(IntPower(0,2)==0);

  assert(IntPower(0,3)==0);

  assert(IntPower(0,4)==0);



  assert(IntPower(1,1)==1);

  assert(IntPower(1,2)==1);

  assert(IntPower(1,3)==1);

  assert(IntPower(1,4)==1);



  assert(IntPower(2,1)==2);

  assert(IntPower(2,2)==4);

  assert(IntPower(2,3)==8);

  assert(IntPower(2,4)==16);



  assert(IntPower(3,1)==3);

  assert(IntPower(3,2)==9);

  assert(IntPower(3,3)==27);

  assert(IntPower(3,4)==81);



  std::cout << "Program finished successfully" << std::endl;

}

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(C++) IntPower

IntPower test