However, that if the data structure is not a subtype of Subtype of IEnumerable, then the type should be whatever type In such cases, if the data structure is a Occasionally, it may not be obvious what type to use for theįoreach loop variable. Because c takes on the value of each character in s, we are able to count how many of them equal ‘i’. Note, however, that we have no access to the location containing c on any particular iteration - this is why we don’t use a foreach loop when we need to know the locations of the elements. Thus, in the above example, c takes the value of a different character in s on each iteration. On each iteration, the variable defined in the foreach statement stores one of the elements in the data structure. The loop then iterates once for each element in the data structure (unless a statement like return or break causes it to terminate prematurely).

Following the keyword in, the data structure being traversed ( s in the above example).

It will take on the values of the elements as the loop iterates. The type of this variable will be the type of the elements in the data structure (i.e., char in the above example).

The name of a new variable ( c in the above example).

The type of the elements in the data structure ( char in the above example).

The foreach statement requires three pieces of information: Because we don’t need to know the locations of these occurrences, we can iterate through the characters with a foreach loop, as follows:

Suppose, for example, that we want to find out how many times the letter ‘i’ occurs in a string s. We can therefore iterate through the elements (i.e., the characters) of a string using a foreach statement, provided we don’t need to know the location of each character in the string (because a string is immutable, we can’t change its contents). The “Implements” section, we see all of theīecause string implements both of these interfaces, it is a NETįramework, as well as all arrays, are subtypes of one of these types.įor example, the string class is a subtype of both IEnumerableĪnd IEnumerable. However, most of the data structures provided in the. Use a foreach loop to iterate through any of these data Of either of the types mentioned in 1 above. Many that you are to write yourself for this class, are not subtypes Many of the data structures provided to you in CIS 300, as well as

Cannot use freac in 10