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Lab 9
Example 1
#include<iostream>
#include<cmath>
using namespace std;
int main()
{
cout << pow(3.0, 2.0);
}
Example 2
#include<iostream>
#include<cmath>
using namespace std;
int main()
{
double x = 3.0, y = 2.0;
cout << pow(x, y);
}
Example 3
#include<iostream>
#include<cmath>
using namespace std;
int main()
{
double result, x = 3.0, y = 2.0;
result = pow(x, y);
cout << result;
}
Program 1
 Write a C++ program that includes a function declaration,
a function call and a function definition for a function that
takes two arguments, all of type int, and that returns the a
char value. Note the name of the function is “great”. The
purpose of the function is to print ‘W’ if the first number is
bigger or equal and print ‘H’ if the second number is bigger.
Solution to Program 1
#include <iostream>
using namespace std;
char great(int first_par, int second_par);
int main( )
{
cout << great(10, 9);
return 0;
}
char great(int first_par, int second_par)
{
if (first_par >= second_par)
return 'W';
else
return 'H';
}
Program 2
 Write a C++ program that includes a function
declaration, a function call and a function definition
for a function that takes three arguments, all of type
int, and that returns the sum of its three arguments.
Note the name of the function is “sum”.
Solution to Program 2
#include<iostream>
using namespace std;
int sum(int n1, int n2, int n3);
int main()
{
cout<<"The sum is "<<sum(1,2,3);
}
int sum(int n1, int n2, int n3)
{
return (n1 + n2 + n3);
}
Program 3
 Write C++ program that includes a function
declaration, a function call and a function definition
for a function that takes two arguments of type double,
and that returns a value of type double that is the
average of the two arguments. Note the name of the
function is “ave”.
Solution to Program 3
#include<iostream>
using namespace std;
double ave(double n1, double n2);
int main()
{
cout<<"The average is "<<ave(1.0,2.0);
}
double ave(double n1, double n2)
{
return ((n1 + n2)/2.0);
}
Program 4
 Write a C++ program that includes a function
declaration, a function call and a function definition
for a function that takes one argument of type double.
The function returns the character value 'P' if its
argument is positive and returns 'N' if its argument is
zero or negative.
Solution to Program 4
#include<iostream>
using namespace std;
char positive_test(double number);
int main()
{
cout<<positive_test(1.0);
}
char positive_test(double number)
{
if (number > 0)
return 'P';
else
return 'N';
}
Program 5
 Write a C++ program that includes a function
declaration, a function call and a function definition
for a function called “even” that takes one argument of
type int and returns a bool value. The function returns
true if its one argument is an even number; otherwise,
it returns false.
Solution to Program 5
#include<iostream>
using namespace std;
bool even(int n);
int main()
{
cout<<even(4);
}
bool even(int n)
{
return ((n % 2) == 0);
}
Program 6
 Write a C++ program that will print the outputs of the following arithmetic
expressions?
Program 7
 Write a C++ program that converts the following
expressions to a C++ arithmetic expression
Program 8
 Write a C++ program to compute and output the
square root of PI; PI is approximately 3.14159. The
const double PI is predefined in cmath. You are
encouraged to use this predefined constant.
Program 9
 Write a C++ program that includes a function
declaration, a function and a function definition for a
function called “in_order” that takes three arguments
of type int. The function returns true if the three
arguments are in ascending order; otherwise, it returns
false.
For example, in_order(1, 2, 3) and in_order(1, 2, 2) both
return true, while in_order(1, 3, 2) returns false.
Program 10
 Write a C++ program that includes a function
declaration, a function call and a function definition
for a function “is_root_of” that takes two argument of
type int and returns a bool value. The function returns
true if the first argument is the square root of the
second; otherwise, it returns false.