Disclaimer:
Ths blog for educational purposes only.
Tools needed:
1.
PC running Windows Operating
System (OS)
2.
Connection to the Internet.
Turn on the PC and log into it using your student
account information.
Important Tip # 1:
Instead of using USB drive to copy your work done in
the lab, log into your nu.edu.pk email id and copy the data to the associated
GoogleDrive. The reason is that since USB drives get plugged into lots of
systems, their probability of carrying a virus increases. It wouldn't only risk
the lab computer, but in case the lab system contains viruses, your USB drive
will carry it and infect your home computer/laptop too!
Save your work by pressing Ctrl+S on the PC and enable
auto-sync feature to syncit to your GoogleDrive automatically. This way, if a
power failure occurs, your work would be saved. Even if the PC's HardDisk crashes
irretrievably, your work would still be safe.
Writing
a meaningful DevC++ Code:
Run DevC++ IDE now. Open a new code file and save it as
lab02_1.cpp.
1.
Write the following code
verbatim into it and save it.
#include
<iostream>
using
namespace std;
int main()
{
int a,b,sum;
cout<<"Enter the 1st number:
";
cin>>a;
cout << "Enter the 2nd number:
";
cin>>b;
sum=a+b;
cout<< endl << "Sum of
two numbers:"<< sum << endl;
return 0;
}
|
Code:
lab02_1.cpp
Task
# 1:
Run the code lab02_1.cpp
with several different inputs and explain what it does.
Inputs Outputs
1 , 3 1+3=
4
2 , 5 2+5=
7
5 , 7 5+7=
12
8 , 8 8+8= 16
3 , 3 3+3=
9
The program takes
input of two numbers from user then adds the two numbers and displays the
Result
Task
# 2:
Change the code lab02_1.cpp
so that it also includes the functionality of subtraction, multiplication
and division. The code should display the results as well.
#include <iostream>
using namespace std;
int main()
{
int a,b,sum,div,mul,sub;
cout<<"Enter the 1st number: ";
cin>>a;
cout
<< "Enter the 2nd number: ";
cin>>b;
sum=a+b;
div=a/b;
mul=a*b;
sub=a-b;
cout<<
endl << "Sum of two numbers:"<< sum << endl;
cout<<
endl << "Multipication of two numbers:"<< mul<<
endl;
cout<<
endl << "Division of two numbers:"<< div << endl;
cout<<
endl << "Subtraction of two numbers:"<< sub <<
endl;
return 0;
}
1.
Write the following code in
DevC++ and try to find the logic of the code.
#include <iostream>
using namespace std;
int main()
{
double length, width,
answer;
cout <<
"Enter length and width of a rectangle\n";
cin >> length
>> width;
answer = length * width;
cout <<
"Area of rectangle is "
<< answer << endl;
return 0;
}
|
Code:
lab02_2.cpp
Task
# 3:
By making a small change in this program, you can
calculate perimeter. Try it. Mention the changes you perform to obtain desired
result
Code for Area:
answer = length * width;
Change:
answer = length * width; to
answer = 2*(length+width);
cout << "Area of rectangle
is " << answer <<
endl; to cout <<
"perimeter of rectangle is "
<< answer << endl;
Code for Perimeter:
answer = 2*(length+width);
1. Write the following code to find out what
does this code do.
#include <iostream>
using namespace std; int main()
{
char test_alphabet; cout << "Enter an alphabet to check if it is a vowel: "; cin >> test_alphabet; // Taking Input character; if(test_alphabet == ’a’ || test_alphabet==’e’ || test_alphabet ==’i’ || test_alphabet==’o’|| test_alphabet== ‘u’) { cout<<”alphabet entered is a vowel”<<endl; }
else
{
cout << "alphabet is not a vowel”<<endl; return 0; } } |
Code:
lab02_3.cpp
Task
# 4:
Test
above code with different inputs. Enter a vowel e.g “ i ” and a consonant e.g
“b” to test the code.
INPUT
OUTPUT
i
alphabet entered is a vowel
j alphabet is not a vowel
e
alphabet entered is a vowel
Task # 5:
Now
try a capital vowel letter “A” and give the output? Try other capital vowel
letters too.
INPUT
OUTPUT
A
alphabet
is not a vowel
E
alphabet is not a vowel
I
alphabet is not a vowel
O
alphabet
is not a vowel
U
alphabet
is not a vowel
Task # 6:
Can
you try to change/modify the code so that it works for capital letters ?
Change
in code:
if(test_alphabet == 'a' ||
test_alphabet=='e' || test_alphabet =='i' || test_alphabet=='o'||
test_alphabet== 'u')
To if(test_alphabet == 'A' ||
test_alphabet=='E' || test_alphabet =='I' || test_alphabet=='O'||
test_alphabet== 'U')
INPUT
: OUTPUT
A
alphabet entered is a vowel
E
alphabet entered is a vowel
I alphabet entered is a vowel
1. Given the below template run it in IDE and
try to understand what it does.
#include <iostream>
using namespace std;
int main()
{
int i=1;
/* The loop would continue to print
* the value of i until the given condition
* i<=15 is false.
*/
while(i<=15)
{
cout<<"Value of variable i is: "<<i<<endl;
i=i+1;
}
}
|
Code:
lab02_4.cpp
Task
# 7:
Explain
what does the above code does.
Explanation:
The code is for
an incremental program in which the value of variable i
keeps on changing until it reaches specified value of 15 after it reaches the specified value program
stops.
Task # 8:
Change
the condition in while loop so that the variable is printed until it reaches a
value of 100.
Change :
int i=1;
/* The loop
would continue to print
* the value
of i until the given condition
* i<=15
is false.
*/
while(i<=15)
To
int i=1;
/* The loop
would continue to print
* the value
of i until the given condition
* i<=100
is false.
*/
while(i<=100)
1. Write the following code to find out what
does this code does.
#include <iostream>
using namespace std; int main()
{
int Number, Reverse = 0; cout << "Input a Number to Reverse and press Enter: "; cin >> Number; // Taking Input Number in variable number. while( Number!= 0 ) //while loop for repetition. { Reverse = Reverse * 10; Reverse = Reverse + Number%10; Number = Number/10; } cout << "New Reversed Number is: "<< Reverse << endl; return 0; } |
Code:
lab02_5.cpp
Task
# 9:
Test
above code. Explain what does this code do. Are there any limitations of this
code. If ‘Yes’, mention them.
The above code is
a program which reverses the digits of a number by using the formula
Reverse=Reverse*10;
Reverse=Reverse+Number%10;
Number = Number/10;
Reverse=Reverse+Number%10;
Number = Number/10;
Yes’s there is
limitation as for instance if we enter
123456789 program returns 987654321
But if we
increase digits from 9 to 10 and beyond e.g 12345678910 returns -1126087180
So program has a limit of 9 digits that it can
reverse.
