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Fundamentals of Programming, ETSII
Pract. 1, Lesson 2-
1 Introduction to the programming environment. Edit/compile/execute, copying the
given source program, both in a Terminal+Editor and in the Eclipse environments.
Feel free to change the message and the heading comments.
2 The next program computes and display the
2. Change it so it can solve the
equation ax
+ bx + c = 0 with x
− 2 x − 3 = 0, using the formula: x 1 =
−b+
b^2 − 4 ac 2 a
x 2 =
−b−
b^2 − 4 ac 2 a equs.cpp 14/10/14 10:
// equs.cpp
// juanfc 2014-10-
// Some maths
#include
#include
using namespace std;
int main()
float x = 2 ;
cout << "The square root of " << x
<< " is: " << sqrt(x) << endl;
return 0 ;
You should ask the user for the three coefficients a, b, c of the ax
+ bx + c = 0
equation. These are three real (float) numbers. Then applying the recipe, write on
the screen the resulting values: x 1 , x 2
3 The next C++ program computes the net and gross salaries to be paid for a job done
as a function of the worked days and hours. However, when you try to compile it,
several errors raise. The student should spot those errors and fix them. The compiler
signs and messages should them be interpreted and be followed appropriately.
1 # include < iostream > 2 using namespace std ; 3 4 const tax : 25.0; 5 const HOURLY_PAY = 60. 6 7 int main ()
2
9 double hours , days , total , net ; 10 11 cout << " Enter the number of worked hours : " ; 12 cin << hours ; 13 cout << " Enter the number of worked days : " ; 14 cin >> days ; 15 hours * days * HOURLY_PAY = total ; 16 net = total - TAX ; 17 cout << " The gross amount to be paid is : " ; 18 cout << total << endl ; 19 cout << " The net amount to be paid is : " ; 20 cout << NETO << endl ; 21 22 return 0; 23 }
4 Write a program that allows the input of an integer data type and then it writes it
on the screen. Run this program entering a valid, legal, integer number; run it again
but entering a no valid integer number, any word, for example. Write a comment at
the program source headings explaining the differences between both behaviours.
5 Write a program that display on the screen the size in bytes of every data type
studied in class: int, long, char, etc. Use the operator: sizeof
6 Write a program that reads 4 letters, and then writes those letters but encoded,
writting then, instead of each letter, its next letter in the ASCII table. For example,
if entered SETO, it should print: TFUP.
7 Write a program that reads a natural number, standing for a number of bytes. Then
print the amount of MegaBytes (MB), KiloBytes (KB), and bytes (B) that that
number contains. For example: for the number 26871979, it should print: 25 MB,
642 KB, and 171 B
8 The next program converts an age, entered in years, to days:
1 # include < iostream > 2 using namespace std ; 3 4 int main () 5 { 6 int ageYears ; 7 cout << " Input the age in years : " ; 8 cin >> ageYears ; 9 int ageDays = ageYears * 365; 10 cout << " Days : " << ageDays << endl ; 11 return 0; 12 } 13
Make a program to do the opposite ask for the age in days and display the age in
years (discard the remainded days that not complete a complete year). In order to
ask for a number (or a char or a string... ) we can use in this case:
cin >> age;
In doing so, our program will await there for us to enter a number and that number
will be assigned to the variable age, the only variable we need.
9 A student wants to know their final mark in the subject FP. That mark is built from
the mark in the final exam and the marks in the two tests. The weight of the final
exam mark is wf = 1 − 0. 15 × (m 1 + m 2 )/10. So to obtain the final mark we must
do: mf × wf + (m 1 + m 2 ) × 0 .15.
Ask the user for the final exam, mf , and m 1 and m 2 (all of them over 10), and
display their final mark.
