Object Oriented Programming 2nd Class Part 2

CSE222: Object Oriented Programming  Lab 2

Lab Objectives

To gain experience with

• the activity of programming
• Write some simple C++ program
• using cin object
• simple expressions

Here is a simple example of a C++ program for doing average of two numbers
Type in the following program and run it.

 1 #include <iostream.h>


2 using namespace std;


3 int main()

4 {


5     float number1,number2,sum,average;


6     cout << "Enter two numbers: "; //prompt


7     cin >> number1;


8    cin >> number2;


9    sum= number1+number2;


10    //average= sum/2;


11    cout << "Sum=" << sum<<"\n";


12    cout << "Average= " << (sum/2) <<"\n";


13    return 0;


14 }

This is a simple C++ program that uses iostream.h for output. and input. Here we can see that we can output numeric data on the screen. In our first lab we see how to display some string with using back slash character .We also see that above program also uses simple expressions.

In line number 7 and 8 we use two cin statements to get two integer numbers from key board. We can use both statement in one statement like cin >> number1 >>number2.

This statement will do the same thing. On line number 10 we make the statement into comments. On line number 12 we calculating and displaying average so we didn’t use the line number 10. Here we see how to print numeric data.

Now using the experience of this program do the following programs exercise? Your output should be attractive. This all program will use simple expressions only.

1.      Write a program that converts Celsius to Fahrenheit. The formula is

F = ⁹/₅C + 32.

2.      Write a program to calculate the volume of a sphere,

Volume =⁴/₃r³

3.      Write a program to print out the perimeter of a rectangle given its height and width.

       Perimeter = 2 · (width + height)

4.      Write a program that takes hours and minutes as input and outputs the total number of minutes (e.g., 1 hour 30 minutes = 90 minutes).

5.      Write a program that takes an integer as the number of seconds and outputs the total hours and minutes and seconds (e.g., 3665 seconds = 1 hour 1 minute 5 seconds).