1.3 Labworks  (Page 12/11)

Table of contents

Lab Session 1:

Introduction to C++

Lab Session 2:

Selection Structures

Lab Session 3:

Repetition Structures

Lab Session 4:

Arrays

Lab Session 5:

Structures

Lab Session 6:

Functions

Lab Session 7:

Pointers

Lab Session 8:

Introduction to Classes

Lab Session 9:

Object Manipulation

Lab Session 10:

Inheritance

Programming Project Topic Examples

Lab session 1: introduction to c++

1. objective

The objectives of Lab 1 are (1) to known how to run a simple C++ program; (2) to know the basic data types and operators; (3) to learn how to use variable declarations and assignment statements.

2. experiment

2.1) Test the following program:

#include<iostream.h>

int main()

{

const float PI=3.14159;

float radius = 5;

float area;

area = radius * radius * PI; // Circle area calculation

cout<<“The area is “<<area<<“ with a radius of 5.\n”;

radius = 20; // Compute area with new radius.

area = radius * radius * PI;

cout<<“The area is “<<area<<“ with a radius of 20.\n”;

return 0;

}

1. Run the above program
2. Use #define to define the constant PI
3. Declare the constant PI in the file “mydef.h”, and then use the #include directive to insert the header file in the above program.

2.2) Debug the following code segment.

#include<iostream.h>

int main()

{

const int age=35;

cout<<age<<“\n”;

age = 52;

cout<<age<<“\n”;

return 0;

}

2.3) What is the result of each following expression:

1. 1 + 2 * 4 / 2
2. (1 + 2) * 4 / 2
3. 1 + 2 * (4 / 2)
4. 9 % 2 + 1
5. (1 + (10 - (2 + 2)))

2.4) Run the following programs and explain their results.

a.

void main()

{

short i = -3;

unsigned short u;

cout<<sizeof(i)<<&i;

cout<<sizeof(u)<<&u;

cout<<(u = i)<<"\n";

}

b.

void main()

{

byte i = 125*4/10;

cout<<i<<"\n";

}

2.5) Write a program that inputs two time points and display the difference between them.

2.6) Run the following programs and explain their results:

a.

#include<iostream.h>

int main()

{

int f, g;

g = 5;

f = 8;

if ((g = 25) || (f = 35))

cout<<“g is “<<g<<“ and f got changed to “<<f;

return 0;

}

b.

#include<iostream.h>

void main()

{

if (!0)

{ cout<<“C++ By Example \n”; }

int a = 0;

if ( a !=0&&2/a>0 )

cout<<“hello”;

}

2.7) Write a program that inputs the three grades for mathematics, physics and chemistry. And then it displays the average of the three grades in the following format:

Lab session 2: selection structures

1. objective

The objective of Lab 2 is to practice C++’s selection structures, such as:

• if
• if … else
• switch

2. experiment

2.1) Run the following program:

// BEEP : ‘\x07’

#include<iostream.h>

#define BEEP cout<<“\a \n”

int main()

{

int num;

cout<<“Please enter a number “;

cin>>num;

if (num == 1)

{ BEEP; }

else if (num == 2)

{ BEEP; BEEP; }

else if (num == 3)

{ BEEP; BEEP; BEEP; }

else if (num == 4)

{ BEEP; BEEP; BEEP; BEEP; }

else if (num == 5)

{ BEEP; BEEP; BEEP; BEEP; BEEP; }

return 0;

}

2.2) Run the following program:

#include<iostream.h>

#define BEEP cout<<“\a \n”

int main()

{

int num;

cout<<“Please enter a number “;

cin>>num;

switch (num)

{

case (1): { BEEP;

break; }

case (2): { BEEP; BEEP;

break; }

case (3): { BEEP; BEEP; BEEP;

break; }

case (4): { BEEP; BEEP; BEEP; BEEP;

break; }

case (5): { BEEP; BEEP; BEEP; BEEP; BEEP;