Pascal - Relational Operators

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Following table shows all the relational operators supported by Pascal. Assume variable A holds 10 and variable B holds 20, then:

OperatorDescriptionExample
= 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.

Try the following example to understand all the relational operators available in Pascal programming language:

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.

When the above code is compiled and executed, it produces the following result:

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


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