why it gives,Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters.

When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters.

[Steven Lord]

Please don't write your code in the tags, write it in your question. It'll be much easier to read, and you don't need to worry about the tags being reordered.

Answer 1

[madhan ravi]

When asking a question provide the code in the question not in tags. See if you have correct number of parentheses in the function.