Page 197 - PowerPoint Presentation

CAVITE STATE UNIVERSITY
T3 CAMPUS
Department of Information Technology COSC 65 – Programming Languages

Example of nested for loop:

for (int i=1; i<=5; i++) { OUTPUT: for (int i=1; i<=5; i++) { OUTPUT:
for (int j = 1; j<=5; j++) { * * * * * for (int j = 1; j<=5; j++) { 1 1 1 1 1
System.out.println(“ * “); * * * * * System.out.println(i); 2 2 2 2 2
} * * * * * } 3 3 3 3 3
System.out.println(); * * * * * System.out.println(); 4 4 4 4 4
} * * * * * } 5 5 5 5 5

The nested for loop is a loop within a loop, an inner loop within the body of an outer
loop. How this works is that the first pass of the outer loop triggers the inner loop, which
executes to completion. Then the second pass of the outer lop triggers the inner loop again.
This repeats until the outer loop finished

Java Array
An array is a fixed-length structure hat stores multiple values of the same type. You
can group values of the same type within arrays. An item in an array is called an element.
Every element can be access via an index. The first element in an array is addressed via 0
index, the second via 1 and so on.
Here is the graphical representation on an array with size 10.

0 1 2 3 4 5 6 7 8 9
Single Dimension Array
Array Declarations and Array Initialization
- int num[] = new int[10]
- float marks[] = new float[5]
- String NameofStudents[] = new String[“ “, “ “]

Let’s see the simple example of Java array, where we are going to declare, instantiate,
initialize and traverse an array.
// Java program to illustrate how to declare, instantiate, initialize and traverse the Java Array

class TestArray {
public static void main (String[]args){

int arr[] = new int[5]; // variable arr declaration as an array that can store 5 integers (array 0-4)

arr[0] = 0; // variable initialization
arr[1] = 10;
arr[2] = 20;
arr[3] = 30;
arr[4] = 40;

for (int i=0; i<arr.length; i++) { // displaying the array
System.out.println(arr[i]); // prints 0 10 20 30 40 downwards
}
}

}

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