パスカル-関係演算子

次の表は、Pascalでサポートされているすべての関係演算子を示しています。変数 A が10を保持し、変数 B が20を保持すると仮定します-

Operator	Description	Example
=	Checks if the values of two operands are equal or not, if yes, then condition becomes true.	(A = B) is not true.
<>	Checks if the values of two operands are equal or not, if values are not equal, then condition becomes true.	(A <> B) is true.
>	Checks if the value of left operand is greater than the value of right operand, if yes, then condition becomes true.	(A > B) is not true.
<	Checks if the value of left operand is less than the value of right operand, if yes, then condition becomes true.	(A < B) is true.
>=	Checks if the value of left operand is greater than or equal to the value of right operand, if yes, then condition becomes true.	(A >= B) is not true.
⇐	Checks if the value of left operand is less than or equal to the value of right operand, if yes, then condition becomes true.	(A ⇐ B) is true.

Pascalプログラミング言語で利用可能なすべての関係演算子を理解するために、次の例を試してください-

program showRelations;
var
a, b: integer;

begin
   a := 21;
   b := 10;

   if a = b then
      writeln('Line 1 - a is equal to b' )
   else
      writeln('Line 1 - a is not equal to b' );

   if  a < b then
      writeln('Line 2 - a is less than b' )
   else
      writeln('Line 2 - a is not less than b' );

   if  a > b then
      writeln('Line 3 - a is greater than b' )
   else
      writeln('Line 3 - a is greater than b' );

   ( *Lets change value of a and b* )
   a := 5;
   b := 20;

   if  a <= b then
      writeln('Line 4 - a is either less than or equal to b' );

   if ( b >= a ) then
      writeln('Line 5 - b is either greater than  or equal to ' );
end.

上記のコードをコンパイルして実行すると、次の結果が生成されます。

Line 1 - a is not equal to b
Line 2 - a is not less than b
Line 3 - a is greater than b
Line 4 - a is either less than or equal to b
Line 5 - b is either greater than or equal to b

Pascal-relational-operators

パスカル-関係演算子