Question

Как в паскале записать программу , решающее выражение 7х²-2(х-3)/х-3? Проводится работа с операторами (если, то, иначе) и при написании вылезает ошибка 1001 "переменной не присвоено значение". Что делать, спасите?

Answer 1

VAR
x,a,b: Integer;
y: Real;
Begin
WriteLn('Введите x');ReadLn(x);
if  x = 3 then begin
WriteLn('Знаменатель равен 0!');
end else begin
a:= x - 3;
b:= 7 * x * x - a * 2;
y:=b / a;
WriteLn(y);
end;
end.

Answer 2

//Мои скромные соображения относительно данной задачи. Если написала не то, не обессудьте.
var x:integer;
y:real;
Begin;
Writeln ('Введите значение х:');
Readln(x);
If x=3 then writeln ('Знаменатель равен 0!')
else
y:=(7*sqr(x)-(x-3)*2)/(x-3);
Writeln('у=',y);
End.

Answer 3

Writing a Program in Pascal to Solve the Expression

To write a program in Pascal to solve the expression \(7x^2 - \frac{2(x-3)}{x-3}\), you can use the following code snippet:

program ExpressionSolver;
var
   x, result: real;
begin
   writeln('Enter the value of x: ');
   readln(x);
   if x <> 3 then
   begin
      result := 7 * x * x - 2;
      writeln('The result is: ', result);
   end
   else
      writeln('The expression is undefined for x = 3');
end.

In this program, the user is prompted to enter the value of \(x\). Then, the program checks if \(x\) is not equal to 3. If it is not equal to 3, the program calculates the result of the expression \(7x^2 - \frac{2(x-3)}{x-3}\) and displays it. If \(x\) is equal to 3, the program informs the user that the expression is undefined for \(x = 3\).

Handling the "Variable Not Assigned a Value" Error (Error 1001)

The error "variable not assigned a value" (Error 1001) typically occurs when a variable is being used without being assigned a value. In the context of the provided expression, this error can occur if the variable \(x\) is not initialized before being used in the program.

To resolve this error, ensure that the variable \(x\) is assigned a value before it is used in the program. In the provided Pascal code snippet, the user is prompted to enter the value of \(x\), which initializes the variable before it is used in the expression calculation. This should prevent the "variable not assigned a value" error from occurring.

If you are still encountering the error after ensuring that the variable \(x\) is initialized, please double-check the code to ensure that all variables are properly initialized before use. Additionally, ensure that the program flow handles all possible input scenarios to prevent unexpected errors.

Feel free to try running the provided Pascal program with the expression and let me know if you encounter any further issues!