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CS106 Programming Fundamentals

Submission Instructions•  Submission by email to raza.rehman@abasyn.edu.pk 

 –  Subject of the email should be

 –  CS106-PS3-YourName-RegNo

 –  No collaboration allowed.

 –  Due Date : 12th Nov 9 am

 –  You should send cpp files with names Task1.cpp, Task2.cpp … in onezip file

Problem Set 3 (Loops and Iterations)

Task 1

Suppose that there is a class of 30 students. You are required to make a program to

calculate the number of As, Bs,Cs and Fs where A,B,C and F are the only grade

options. You must remember that you cannot declare thirty different variables for

the grades of the students, rather you have to use loops to take input from the user.

The output should be properly formatted using setw etc.

Task 2

Make a program with the ability to print first 20 odd numbers, even numbers or

prime numbers based on the input from the user. Your program should have the

following menu1)  Press 1 to generate first 20 even numbers

2)  Press 2 to generate first 20 odd numbers

3)  Press 3 to generate first 20 prime numbers

Note that you have to use loops in the program. Furthermore, knowledge of 

arithmetic series can help in generating odd and even numbers

Task 3

Given a number find all the factors of the number. Factors of a number x are the

numbers which one multiplied by some other number result in x. For example the

factors of 12 include 1,2,3,4,6,12. ( Hint: if y is a factor of x then x remainder y is

equal to zero)

Task 4

Make a program that repeatedly asks the user to enter three different values and

checks whether the values can represent length of sides of triangle. If hyp

represents length of hypotenuse of the triangle, base represents length of base of the

triangle and alt represents the length of altitude of the triangle then hyp2=base2 +

alt 2 

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You have to take care of two more things in this program that the user may not 

enter the values in any order implying that in one case the user may first enter the

value of base first while in the other case he may enter the value of altitude first.

Furthermore, after every check you have to ask the user whether he wants to enter

another value or not. If the user enters y then you should again take the input and

apply the checks.

Task 5

Make a program that calculates the sum of n numbers where n and the numbers are

all going to be entered by the user

Bonus Questions

Make a program to generate first n numbers of the Fibonacci Series using loops. Nth

number of the Fibonacci Series can be generated as per the following formula

() { ( ) ( ) 

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Tips &Tricks/ Advice/Recommendations/Additional References

Advice (taken from Section 4.10 of Bjarne Stroustrup, “C++ Programming

Language,” 3rd Edition, 2000.)

1.  Keep scopes small.

2.  Don’t use the same name in both a scope and an enclosing scope. 

3.  Declare one name (only) per declaration.

4.  Keep common and local names short, and keep uncommon and nonlocal

names longer.

5.  Avoid similar-looking names.

6.  Maintain a consistent naming style.

7.  Choose names carefully to reflect meaning rather than implementation.

8.  Use a typedef to define a meaningful name for a built-in type in cases in

which the built-in type used to represent a value might change.

9.  Use typedef s to define synonyms for types; use enumerations and classes to

define new types.

10. Remember that every declaration must specify a type (there is no ‘‘implicit 

int ”) 

11. Avoid unnecessary assumptions about the numeric value of characters.

12. Avoid unnecessary assumptions about the size of integers.

13. Avoid unnecessary assumptions about the range of floating-point types.

14. Prefer a plain int over a short int or short or a long int or a long.

15. Prefer a double over a float or a long double.

16. Prefer plain char over signed char and unsigned char .

17. Avoid making unnecessary assumptions about the sizes of objects.

18. Avoid unsigned arithmetic.

19. View signed to unsigned and unsigned to signed conversions with suspicion.

20. View floating-point to integer conversions with suspicion.

21. View conversions to a smaller type, such as int to char , with suspicion.

For detail on these advices, please read the relevant sections in the above

mentioned book.

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  Another important thing, develop habit to declare and initialize the variable

at the same time.