Qt has its own keyword foreach to iterate through the elements of the containers. This keyword was introduced before the C++11 standard and is a macro. At this point in the C++11 standard, there are range-based for loops that perform the same functionality as foreach .

But in both cases there are nuances. Let's figure it out.

C++ provides a standard set of operators for selecting a selection and cycles.

The keywords related to the construction of branching conditions for the code are:

• if
• else
• switch
• case
• break
• default

The key words relating to the construction of cycles are:

• do
• while
• break
• continue
• for

This chapter explores more of ruby's control structures.

case

We use the case statement to test a sequence of conditions. This is superficially similar to switch in C and Java but is considerably more powerful, as we shall see.

ruby> i=8
ruby> case i
    | when 1, 2..5
    |   print "1..5\n"
    | when 6..10
    |   print "6..10\n"
    | end
6..10
   nil