Question

I add the last function and importance function – bSearch() and link it with combining() as following

       combining::[BookInfo]->[[Int]]

       combining books=superBubble [(map index books)] 
        bSearch [xs] key s
                  if length[xs] <> s then return 9999
                  else
                  if
                    key=m then elemIndex m [xs]
                  else
                    if key<m then bsearch (splitAt (x:xs) o) key o 
                   else bsearch (splitAt ms (o+2) ) key n  
                  o<-s/2-1
                  n<-length ms
        finalBsearch::(Ord)=> [a]->a->a->Int
        finalBsearch ms key s= bsearch  (combining [ms]) key s  

but it give me an error Syntax error in input (unexpected keyword "if") at line 5
thank u for help
= for more details about the full code see runtime error in Haskell

But please give me instructions only not full solution

Answer 1

For a quick fix, enclose the whole if–then–else expression in parentheses: (–). But this will fix only this error message. Your code contains many more errors. I can’t tell what you expect this code to do.

Instead of using cascading if–then–elses, you may find it clearer to use guards.

n.b. You do not have an exception; you have a compilation error.