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Exercise 1
The following is a function declaration for finding the area of a rectangle.
int rectangle_area(int width, int height);
Implement a function for finding the area of a rectangle.
Use the following code to test your program
// author
// date
// title
#include <iostream.h>
int rectangle_area(int width, int height);
void main()
{
int w, h;// width and height of rectangle
int a;// area
cout << "What is the width of the rectangle? " << endl;
cin >> w;
cout << "What is the height of the rectangle?" << endl;
cin >> h;
a = rectangle_area(w, h);
cout << "The area of the rectangle is " << a << endl;
}
// rest of the code goes here
Exercise 2
You have previously written a program for displaying times-tables, e.g.
1 x 2 = 2
2 x 2 = 4
2 x 3 = 6...
Write a function called void table(int x) which prints out the x times tables.
The following code should be used for testing the program...
// Times Tables Tester
// date
// author
#include <iostream.h>
void table(int x);
void main()
{
for (int i=1;i<=12;i++)
table(i);// display i times table
}
// rest of your code...
Exercise 3
Write a function:
float CtoF(float C)
which converts degrees Centigrade to Fahrenheight
and a second function:
float FtoC(float F)
which converts degrees Fahrenheit to Centigrade.
The formula is C = (F-32)*5/9
The main program runs in a loop, asking the user which conversion they want to do (or 0 to exit), and then a value for the temperature. The program should display the converted temperature.
If the following temperatures are entered, the program should print out an informational message:
TemperatureMessage
<273CInvalid temperature - below absolute zero!
0CFreezing point of water
100CBoiling point of water
>5000CHotter than temperature of the Sun
Hint: the temperatures are shown in degrees Centigrade.
Exercise 4
A large number of functions to do maths are available, when you add the line
#include <math.h>
to the top of your program.
These include:
double sin(double alpha)
double cos(double alpha)
double tan(double alpha)
double sqrt(double x)
For the trig functions, angle alpha is in radians.
To convert from radians to degrees, use:
angle_in_deg = angle_in_rad*180/PI;
where const double PI = 3.14159;
Problem:
The figure below shows a person looking at a high wall.
Write a function:
double height_of_wall(double p, double alpha, double d)
which returns the height of the wall.
Exercise 5
A. Write a function:
int odd(int x)
which returns 1 if x is odd, and 0 otherwise
B. Write a function:
int isPositive(int x)
which returns 1 if x is positive, and 0 otherwise
TRICKY...
C. Write a function
int isPrime(int x)
which returns 1 if x is a prime number, and 0 otherwise
Exercise 1
The following is a function declaration for finding the area of a rectangle.
int rectangle_area(int width, int height);
Implement a function for finding the area of a rectangle.
Use the following code to test your program
// author
// date
// title
#include <iostream.h>
int rectangle_area(int width, int height);
void main()
{
int w, h;// width and height of rectangle
int a;// area
cout << "What is the width of the rectangle? " << endl;
cin >> w;
cout << "What is the height of the rectangle?" << endl;
cin >> h;
a = rectangle_area(w, h);
cout << "The area of the rectangle is " << a << endl;
}
// rest of the code goes here
Exercise 2
You have previously written a program for displaying times-tables, e.g.
1 x 2 = 2
2 x 2 = 4
2 x 3 = 6...
Write a function called void table(int x) which prints out the x times tables.
The following code should be used for testing the program...
// Times Tables Tester
// date
// author
#include <iostream.h>
void table(int x);
void main()
{
for (int i=1;i<=12;i++)
table(i);// display i times table
}
// rest of your code...
Exercise 3
Write a function:
float CtoF(float C)
which converts degrees Centigrade to Fahrenheight
and a second function:
float FtoC(float F)
which converts degrees Fahrenheit to Centigrade.
The formula is C = (F-32)*5/9
The main program runs in a loop, asking the user which conversion they want to do (or 0 to exit), and then a value for the temperature. The program should display the converted temperature.
If the following temperatures are entered, the program should print out an informational message:
TemperatureMessage
<273CInvalid temperature - below absolute zero!
0CFreezing point of water
100CBoiling point of water
>5000CHotter than temperature of the Sun
Hint: the temperatures are shown in degrees Centigrade.
Exercise 4
A large number of functions to do maths are available, when you add the line
#include <math.h>
to the top of your program.
These include:
double sin(double alpha)
double cos(double alpha)
double tan(double alpha)
double sqrt(double x)
For the trig functions, angle alpha is in radians.
To convert from radians to degrees, use:
angle_in_deg = angle_in_rad*180/PI;
where const double PI = 3.14159;
Problem:
The figure below shows a person looking at a high wall.
Write a function:
double height_of_wall(double p, double alpha, double d)
which returns the height of the wall.
Exercise 5
A. Write a function:
int odd(int x)
which returns 1 if x is odd, and 0 otherwise
B. Write a function:
int isPositive(int x)
which returns 1 if x is positive, and 0 otherwise
TRICKY...
C. Write a function
int isPrime(int x)
which returns 1 if x is a prime number, and 0 otherwise
