Operator: = (Equal)

The = operator compares two numbers or strings and returns TRUE if they are equal.

Care must be taken when used with floating-point numbers due to rounding errors, e.g. 1.1 + 2.2 <> 3.3.

The comparison is case-sensitive.

See example 2 below.

Example 1:

INCLUDE rtcu.inc
 
VAR
  a : INT;
  b : INT;
  t : BOOL;
END_VAR;
 
PROGRAM test;
 
BEGIN
  ...
  IF a = b THEN
    // Will be executed if a equals b
     ...
  END_IF;
  ...
  t := b = 10; // t is TRUE if b equals 10
  ...
END;
 
END_PROGRAM;

Example 2:

INCLUDE rtcu.inc
 
VAR
  a : STRING := "Peter";
  b : STRING := "Jack";
END_VAR;
 
PROGRAM test;
 
BEGIN
  ...
  IF a = b THEN
    // Will not be executed as "Peter" is not equal to "Jack"
     ...
  END_IF;
END;
 
END_PROGRAM;