Question

Program e; var mas 2 : array [1..10, 1..10] of integer; i, j, k : integer begin for i := 1 to 10 do -⇒ здесь for j := 1 to 10 do -⇒ здесь read (mas2[i, j]; (mas2[1+j]<0); - отсюда мог перепутать порядок for i := 1 to 10 do -⇒ и здесь for j := 1 to 10 do -⇒ и здесь then k := k+1 writeln(k) end. ВОПРОС : Почему цикл for используется два раза ?

Answer 1

Ну так потому что массив у тебя двумерный, следовательно и цикла должно быть 2

Answer 2

The given program is written in a Pascal-like programming language and contains syntax errors. However, I will try to explain the possible intent behind the code and address your question.

The program seems to declare a two-dimensional array called "mas2" with dimensions 10x10, which will hold integer values. Then it proceeds with two nested "for" loops to read values into the array and count the number of elements that are less than zero.

Here's the breakdown of the code:

1. Variable Declaration:

   cssCopy code
   var mas2: array [1..10, 1..10] of integer;
   i, j, k: integer;
   

   This declares the two-dimensional array "mas2," as well as integer variables "i," "j," and "k."

2. Input Loop:

   rustCopy code
   for i := 1 to 10 do
     for j := 1 to 10 do
       read(mas2[i, j]);
   

   These nested loops read integer values into the "mas2" array from the input. It reads a total of 100 integers (10x10 array).

3. Counting Loop:

   rustCopy code
   for i := 1 to 10 do
     for j := 1 to 10 do
       if mas2[i, j] < 0 then
         k := k + 1;
   

   These nested loops iterate over the "mas2" array again and check if each element is less than zero. If it is, it increments the "k" variable by one.

4. Output:

   scssCopy code
   writeln(k);
   

   Finally, the program prints the value of the variable "k," which represents the count of negative elements in the "mas2" array.

Regarding your question about why the "for" loop is used twice, it seems that the program author intended to perform two separate tasks: first, to read values into the "mas2" array, and second, to count the negative elements in the same array. The two nested "for" loops are used for these separate tasks. The first loop reads the values, and the second loop counts the negative elements.

However, it's important to note that the code contains syntax errors and wouldn't run as is. For instance, there are missing semicolons, and the statement "(mas2[1+j]<0);" does not make sense and would cause a syntax error. To correct the code, it should be rewritten as follows:

pascalCopy code
Program e;
var
  mas2: array [1..10, 1..10] of integer;
  i, j, k: integer;

begin
  for i := 1 to 10 do
    for j := 1 to 10 do
      read(mas2[i, j]);

  k := 0; // Initialize the count of negative elements

  for i := 1 to 10 do
    for j := 1 to 10 do
      if mas2[i, j] < 0 then
        k := k + 1;

  writeln(k);
end.

Now, the program should work correctly and provide the count of negative elements in the 10x10 array after reading all the inputs.