Expression rule

Question

How to write a rule which takes two input a char and an integer, ruleInput: (A,2) Output: (A1;A2) 
 anyone can give me the answer

Mike Schmitt · Answer

Yogi Patel said: The requirement is not clear. 
 I like defaulting to the laziest approach possible when the requirements aren't actually spelled out. For instance, the result here is just a rule that returns "(A1;A2)", without specifying how the rule input (if any) is related to that (and my brain is too fried to try guessing). 
 So here's my initial rule suggestion: 
 "(A1;A2)" 
 Straightforwardness: 10/10. Flexibility for different rule inputs: ??/10.

Mike Schmitt · Answer

Less lazy reply: 
 let's pretend the rule input is actually 2 inputs, a character and a "times repeated". I don't feel like writing a parser to accept a comma-separated value when that may have just been OP overly abbreviating what their input is going to be. 
 a!forEach(
 enumerate(ri!repeats),
 ri!character & fv!index
) 
 For "A" and 2, that gives us basically their prescribed output: 
 For "C" and "11", it performs more of the same: