func a(bool) { print 'A'; return bool }
func b(bool) { print 'B'; return bool }
 
# Test-driver
func test() {
    for op in ['&&', '||'] {
        for x,y in [[1,1],[1,0],[0,1],[0,0]] {
            "a(%s) %s b(%s): ".printf(x, op, y)
            eval "a(Bool(x)) #{op} b(Bool(y))"
            print "\n"
        }
    }
}
 
# Test and display
test()