Returning Values Questions

returning-values.md

Returning Values

Questions

1. What is the value of cubeByVolume(9)?
2. 729.
3. What is the value of cubeByVolume(cubeByVolume(2))?
4. cubeByVolume(8) = 512.
5. Using the pow() function, write an alternate implementation of the cubeByVolume function.

double cubeByVolume(double sideLength) {
  return pow(sideLength, 3.0);
}

4. Define a function called squareArea that computes the area of a square of a given sideLength.

double squareArea(double sideLength) {
  return pow(sideLength, 2.0);
}

5. Consider this function:

int mystery( int x, int y) {
  double result = (x + y ) / ( y - x);
  return result;
}

What is the result of mystery(2,3) and mystery(3,5).

1. 5 and 4.
2. Implement a function that returns the minimum of three values.

// Prototype
int findTheSmallest(int, int, int);
// Implementation
int findTheSmallest(int x, int y, int z) {
  if (x < y && x < z) {
    return x;
  } else if (y < x && y < z) {
    return y;
  }
  return z;
}
// Function call
findTheSmallest(1,2,3);
// => 1

Attached Code

#include <iostream>
#include <cmath>

using namespace std;

double steinbergPow( double, double);

int main()
{
	double result1;
	double result2;
	
	result1 = pow( 2.0, 4.0 );
	result2 = steinbergPow( 2.0, 4.0 );
	
	cout << "pow: " << result1 << endl;
	cout << "steinbergPow:  " << result2 << endl;

	cout << endl;
	system("pause");
	return EXIT_SUCCESS;
}

/**
Raises base to the power
@param base is the base
@param power is the exponent
*/
double steinbergPow( double base, double power )
{
	double sum = 1;
	for( int i = 0; i < power ; i++ )
	{
		sum = sum * base;
	}
	return sum;
}

/*
Computes the volume of a cube.
@param sideLength the side length of a cube
@return the volume
*/
double cubeByVolume( double sideLength )
{
	double volume = sideLength * sideLength * sideLength;
	return volume;
}