Vugen: strcmp Example

I was asked to post a simple strcmp example for use in Vugen scripting. Here it is:

if (strcmp(lr_eval_string("{pParameter}"), "") == 0)
 {
 lr_error_message("No parameter value captured. Ending iteration.");
 return 0;
 }
else{
lr_output_message("The parameter value is %s",
    lr_eval_string("{pParameter}"));
};

Anyone care to elaborate in the comments section as to what this code is doing?