[Bug 270154] bc freezes evaluating cbrt(0.01)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=270154

            Bug ID: 270154
           Summary: bc freezes evaluating cbrt(0.01)
           Product: Base System
           Version: 13.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: igor@kolesnik.es

bin/bc enters an infinite loop while evaluating the cube-root of 0.01

bin/bc -l -e 'cbrt(0.1)'
returns .46415888336127788924 (which is expected)

bin/bc -l -e 'cbrt(0.01)'
freezes

Looking at the definition of root(x,n) in lib2.bc the following loop never
exits

        while(r!=q){
                r=q
                q=(p*r+x/r^p)/n
        }

A simple hack makes the cbrt function working.

        while(abs(r-q)>0.000001){
                r=q
                q=(p*r+x/r^p)/n
        }

-- 
You are receiving this mail because:
You are the assignee for the bug.