Im confused on how to call a function and create an output file. Ive done most of the assignment, but am not very familiar with calling functions.

#include // to use cin and cout

#include // to be able to use operator typeid

// Include here the libraries that your program needs to compile

using namespace std ;

// Ignore this; it's a little function used for making tests

inline void _test(const char* expression, const char* file, int line)

{

cerr << "test(" << expression << ") failed in file " << file;

cerr << ", line " << line << "." << endl << endl;

}

// This goes along with the above function...don't worry about it

#define test(EXPRESSION) ((EXPRESSION) ? (void)0 : _test(#EXPRESSION, __FILE__, __LINE__))

// Insert here the prototypes of the functions

// Declare a global constant variable called PI that holds value 3.141592

const double PI = 3.141592;

int main()

{

// Declare a variable named name that holds text

string name;

// Declares variables named height and radius that hold whole numbers

int height, radius;

// Declare a variable named volume that holds double precision real numbers

float volume;

// Prompts the user "May I get your first name please?: "

cout << "May I get your first name please?: " << endl;

// Read the value from the keyboard and stores it in name

cin >> name;

// Prompt the user "Thanks ", name, " , now enter radius and height of the cone please: "

cout << "Thanks " << name << ", now enter radius and height of the cone please: " << endl;

// Read the values from the keyboard and stores them in radius and height respectively

cin >> radius >> height;

// Call function volume_cone() to calculate the volume of the cone and assign the result to volume

// Call function print_data() to print the values entered by the user and the volume of the cone

//system("pause");

// Do NOT remove or modify the following statements

cout << endl << "Testing your solution" << endl << endl;

test(typeid(PI) == typeid(1.)); // Incorrect data type used for PI

test(PI == 3.141592); // Incorrect value used for PI

test(typeid(name) == typeid(string)); // Incorrect data type used for name

test(typeid(height) == typeid(1)); // Incorrect data type used for height

test(typeid(radius) == typeid(1)); // Incorrect data type used for radius

test(typeid(volume) == typeid(1.)); // Incorrect data type used for volume

test(fabs(volume_cone(3,5) - 47.124) < 0.0001); // Incorrect rounding of volume

test(fabs(volume_cone(3, 4) - 37.699) < 0.0001); // Incorrect rounding of volume

//system("pause");

return 0;

}

//************************ Function definition *************************

// Read the handout carefully for detailed description of the functions that you have to implement

// Calculates the square of the value received

// Calculates the volume of the cone using the formula 1 / 3 x Pi x radius^2 x height

// Rounds the value received in the first parameter to the number of digits received in the second parameter

// Prints the volume of the cone