Add string and floating point examples

examples/expression-equality/expression_equality.bal

@@ -32,4 +32,20 @@ public function main() {
  // Since values of simple types do not have a storage identity,
  // `===` will evaluate to `true` because the values are the same.
  io:println(a === b);
+
+ decimal c = 1.0;
+ decimal d = 1.00;
+ // `===` and `==`` are the same for simple values except for floating point types.
+ // The output will be `true` because the values are equal.
+ io:println(c == d);
+ // The output will be `false` because `c` and `d` are distinct values with different precision.
+ io:println(c === d);
+
+ string s1 = "Hello";
+ string s2 = "Hello";
+
+ // The string type is a sequence type, not a simple type, 
+ // but `==` and `===` still behave the same for string comparisons
+ io:println(s1 == s2);
+ io:println(s1 === s2);
 }

examples/expression-equality/expression_equality.out

@@ -6,3 +6,7 @@ true
 false
 true
 true
+true
+false
+true
+true