Labs and Tasks (Arbitrary step)

Открыто с: пятница, 15 августа 2025, 00:00

How to use arbitrary step in for loop & loop

Lab 1:

To do: Output all 2-digit odd numbers from 11 to 21.

Expected output:

11 13 15 17 19 21

✍Algorithm:

Solution 1. With loop

Solution 2. With for loop

for var i:=11 to 21 step(2) do
  print(i)

{0.4 points} Task 1:

To do: Output the sequence 3 5 7 9 … 21 (from 3 to 21 with a step = 2). Make it twice: with loop and for loop.

The fragment of the program:

begin
println('the result with a loop');
var ...;
loop ...;
  ...
println('the result with a FOR loop');
for var ...
  ...
end.

Expected output:

the result with a loop
3 5 7 9 11 13 15 17 19 21
the result with a FOR loop
3 5 7 9 11 13 15 17 19 21

[Program name: L7-task-01.pas]

{0.4 points} Task 2:

To do: Output the sequence of integers: 20 18 16 … 2 (from 20 downto 2 with a step = 2). Make it twice: with loop and for loop.

Expected output:

the result with a loop
20 18 16 14 12 10 8 6 4 2
the result with a FOR loop
20 18 16 14 12 10 8 6 4 2

[Program name: L7-task-02.pas]

{0.4 points} Task 3:

To do: Output the sequence of integers: 15 12 9 6 3 0 (from 15 downto 0 with a step = 3). Make it twice: with loop and for loop.

Expected output:

the result with a loop
15 12 9 6 3 0
the result with a FOR loop
15 12 9 6 3 0

[Program name: L7-task-03.pas]

{0.4 points} Task 4:

To do: Output the sequence of integers: 5 10 15 20 … 100 (from 5 to 100). Make it twice: with loop and for loop.

[Program name: L7-task-04.pas]

Functions z(x)

Lab 2:

To do: Calculate a value of the function z(x) = x³ for all x varying on the interval [1, 7] with a step = 2. Make it twice: with loop and for loop.

Expected output:

the result with a loop
1*1*1 = 1   3*3*3 = 27   5*5*5 = 125   7*7*7 = 343
the result with a FOR loop
1*1*1 = 1   3*3*3 = 27   5*5*5 = 125   7*7*7 = 343

✍Algorithm:

Solution:

begin
  var z, x: integer;
  print('the result with a loop');
  x := 1;
  loop 4 do
  begin
    z := x * x * x;
    print($'{x}^3 = {z}');
    x := x + 2;
  end;
end.
begin
  println('FOR loop SOLUTION 1');
  for var x := 1 to 7 step(2) do
  begin
    var z := x * x * x;
    print($'{x}^3 = {z}');
  end;
end.
begin
  print('FOR loop SOLUTION 2');
  for var i := 0 to 3 do
  begin
    var x := 1 + i * 2;
    var z := x * x * x;
    print($'{x}^3 = {z}');
  end;
end.

{0.5 points} Task 5:

To do: Calculate a value of the function z(x) = x² for all x varying on the interval [3, 12] with a step = 3. Make it twice: with loop and for loop.

Expected output:

the result with a loop
3*3 = 9   6*6 = 36   9*9 = 81   12*12 = 144
the result with a FOR loop
3*3 = 9   6*6 = 36   9*9 = 81   12*12 = 144

[Program name: L7-task-05.pas]

{0.5 points} Task 6:

To do: Calculate a value of the function z(x) = √x for all x varying on the interval [5, 25] with a step = 5. Make it twice: with loop and for loop.

Note: To calculate the square root of a number in Pascal, there's a standard function sqrt(x), e.g.:

var result:=sqrt(2); // the result = 1.4142135623731

Expected output:

the result with a loop
sqrt(5) = 2.23606797749979   sqrt(10) = 3.16227766016838    
sqrt(15) = 3.87298334620742   sqrt(20) = 4.47213595499958  sqrt(25) = 5
the result with a FOR loop
sqrt(5) = 2.23606797749979   sqrt(10) = 3.16227766016838    
sqrt(15) = 3.87298334620742   sqrt(20) = 4.47213595499958  sqrt(25) = 5

[Program name: L7-task-06.pas]

{0.5 points} Task 7:

To do: Calculate a value of the function z(x) = 2x − 2 for all x varying on the interval [5, 20] with a step = 3. Make it twice: with loop and for loop.

Expected output:

2*5-2 = 8   2*8-2 = 14   2*11-2 = 20   2*14-2 = 26   2*17-2 = 32  2*20-2 = 38

[Program name: L7-task-07.pas]

{0.5 points} Task 8:

To do: Calculate a value of the function z(x) = sin(x) for all x varying on the interval [1, 5].

Note 1: To calculate the sine in Pascal, there's a standard function sin(x), e.g.:

var result:=sin(2); // the result = 0.909297426825682

Note 2: To output the floating point number with a specific precision:

writelnFormat('{0:f2}',3.1415); // output: 3.14

Expected output:

'the result of z(x)'      0.84   0.91   0.14  -0.76  -0.96

[Program name: L7-task-08.pas]

How to use real steps in loops

Lab:

To do: Output the sequence: 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0.

✍Algorithm:

Solution 1. With loop

Solution 2. With for loop

{0.4 points} Task 9:

To do: Output the sequence 0.1 0.3 0.5 0.7 0.9 1.1. Make it twice: with loop and for loop.

Expected output:

the result with a loop
0.1   0.3   0.5   0.7   0.9   1.1
the result with a FOR loop
0.1   0.3   0.5   0.7   0.9   1.1

[Program name: L7-task-09.pas]

{0.4 points} Task 10:

To do: Output the sequence: 0.0 0.5 1.0 1.5 2.0 2.5. Make it twice: with loop and for loop.

Expected output:

the result with a loop
0.0   0.5   1.0   1.5   2.0   2.5
the result with a FOR loop
0.0   0.5   1.0   1.5   2.0   2.5

[Program name: L7-task-10.pas]

{0.4 points} Task 11:

To do: A real number is given—the price of 1 kg of candy. The program has to output the prices of 1, 2, …, 10 kg of candy. Use for loop.

Note: Use clear variable names (it's better to use writelnFormat statement).

Expected output:

'enter a price of 1 kg of candy, please: '  
>>> 150.5
the cost of 1 kg = 150.5
the cost of 2 kg = 301
the cost of 3 kg = 451.5
...
the cost of 10 kg = 1505

[Program name: L7-task-11.pas]

{0.4 points} Task 12:

To do: A real number is given—the price of 1 kg of candy. The program has to output the prices of 1.2, 1.4, 1.6, 1.8, 2 kg of candy.

Note: Use clear variable names (it's better to use writelnFormat statement).

Expected output:

'enter a price of 1 kg of candy, please: '  
>>> 100.2
the cost of 1.2 kg =  120.24
the cost of 1.4 kg =  140.28
...
the cost of 2 kg =    200.4

[Program name: L7-task-12.pas]

{0.4 points} Task 13:

To do: Two integers A and B are given. Print the squares of all integers between A and B in ascending order and including these numbers themselves.

Expected output:

'enter two integers, please:  A = , B = '  
>>> 1   >>> -2   
4, 1, 0, 1  
'enter two integers, please:  A = , B = '  
>>> 2   >>> 3   
4, 9
'enter two integers, please:   A = , B = '  
>>> 2   >>> 2   
4

[Program name: L7-task-13.pas]

{0.4 points} Task 14:

To do: Two integers A and B are given. Print the square roots of all integers between A and B in ascending order and including these numbers themselves.

Expected output:

'enter two integers, please: A = , B = '  
>>> 1   >>> 5   
sqrt(1) = 1    sqrt(2) = 1.4142135623731    
sqrt(3) = 1.73205080756888    sqrt(4) = 2     sqrt(5) = 2.23606797749979

[Program name: L7-task-14.pas]