How to Traverse Array | C Programming Tutorial | Learn code Writing in Easy way

Iterating over an array means accessing each element of array one by one. There may be many ways of iterating over an array in Java, below are some simple ways.

Method 1: Using for loop:
This is the simplest of all where we just have to use a for loop where a counter variable accesses each element one by one.
The following code demonstrates a loop that changes the values in an array. In this code, the array is passed as an argument to the static methods in the class. Arrays in Java are objects. The array variables are references to an address in memory. Since arrays can be very large, we do not want to copy them when we pass them into methods. When an array is passed as an argument to a method, the name of the array refers to its address in memory. Therefore, any changes to the array in the method will affect the original array,
Part of an Array¶

You don’t have to loop through all of the elements of an array. You can loop through just some of the elements of an array using a for loop. The following code doubles the first five elements in an array. Notice that it uses a complex conditional (&&) on line 14 to make sure that the loop doesn’t go beyond the length of the array, because if you had an array that had less than 5 elements, you wouldn’t want the code to try to double the 5th element which doesn’t exist! Notice that in this code, the array is a private instance variable of the class ArrayWorker. It is created in the constructor and changed or accessed by the methods.

parameter passing and pass by value, in which the actual argument value is copied into the formal parameter variable. We saw how assigning a new value to a formal parameter variable inside the method does not alter the value stored in the actual argument variable used in the method call.

How come the doubleFirstFive, doubleLastHalf, and doubleLast methods in the last 3 programs were able to modify the contents of an array that was passed into a method through a formal parameter? It is because arrays are objects and the value that gets passed into the method is a reference to the array, meaning a copy of the array’s memory location. Notice the methods do not reassign the formal parameter variable that references the array, but instead use array indexing through the [] operator to assign values into one or more array cells. When you use array indexing to assign a value within a method, you will be assigning to the same array object that was used for the method call.

traverse an array means to access each element (item) stored in the array so that the data can be checked or used as part of a process.

In most high-level languages, it is necessary to create a variable that will track the position of the element currently being accessed. This variable is often referred to as a loop counter.

When used in high-level languages, the name given to the loop counter is usually ‘i’ or ‘counter’.

Traversing an array within upper and lower bounds

If a loop is set to repeat ten times (from 0 to 9) then:

during the first iteration the loop counter will hold the value 0

during the second iteration it will hold 1

during the third iteration it will hold 2 and so on

This lets the program access the elements stored in the array in order.

In the Reference Language example shown below, a variable named ‘i’ is used to track the position of the element being accessed during each iteration of the loop.

This code will count the number of times that a grade ‘A’ is found in the allGrades array.