Java || Searching An Integer Array For A Target Value

July 06, 2012 admin No comments

Here is another actual homework assignment which was presented in an intro to programming class which was used to introduce more practice using integer arrays.

REQUIRED KNOWLEDGE FOR THIS PROGRAM

Integer Arrays For Loops Methods (A.K.A "Functions") - What Are They? Final Variables If/Else Statements

This is a small and simple program which demonstrates how to search for a target value which is stored in an integer array. This program first prompts the user to enter five values into an int array. After the user enters all the values into the system, it then displays a prompt asking the user for a search value. Once it has a search value, the program searches through the array looking for the target value; and wherever the value is found, the program display’s the current array index in which that target value is located. After it displays all the locations where the target value resides, it display’s the total number of occurrences the search value was found within the array.





		
		
			Array Search
			
Java
			
			import java.util.Scanner;

public class ArraySearch
{
	// global variable declaration
	static Scanner cin = new Scanner(System.in);
	static final int NUM_INTS = 5;
	
	public static void main(String[] args)
	{
		// declare variables 
		int searchValue = 0;
		int numOccurences = 0;
		int[] numValues = new int[NUM_INTS]; // int array size is initialized with a const value
		
		// display message to screen
		System.out.println("Welcome to My Programming Notes' Java Program.n");		
		
		// get data from user via a 'for loop'
		System.out.println("Please enter "+ NUM_INTS +" integer values:");
		
		for (int index=0; index < NUM_INTS; ++index)
		{
			System.out.print("#" + (index + 1) + ": ");
			numValues[index] = cin.nextInt();
		}
		
		// get a search value from the user
		System.out.print("Please enter a search value: ");
		searchValue = cin.nextInt();
		System.out.println("");		
		
		// finds the number of occurences the search value was found in the array
		numOccurences = SearchArray(numValues, searchValue);
		
		// display data to user
		System.out.println("nThe total occurrences of value "+ searchValue 
			+ " within the array is: " + numOccurences);		
	}// end of main
	
	// ==== SearchArray ===========================================================
	//
	// This method will take as input the array, the number of array 
	// elements, and the target value to search for. The function will traverse 
	// the array looking for the target value, and when it finds it, display the 
	// index location within the array.
	// 
	// Input:
	//	      limit [IN]  -- the array, the number of array 
	//				elements, and the target value
	//
	// Output:
	//	      The total number of occurrences of the target value in the array
	//
	// ============================================================================
	public static int SearchArray(int[] numValues, int searchValue)
	{
		int numFound=0;
		for (int index=0; index < NUM_INTS; ++index)
		{
			if (numValues[index] == searchValue)
			{
				System.out.println("t" + searchValue + " was found at array " +
						"index #" + index);
				++numFound; // if the search values was found,
				           // increment the variable by 1
			}
		}
		return numFound;
	}
}// http://programmingnotes.org/
			
				
					
				
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						import java.util.Scanner;
 
public class ArraySearch
{
	// global variable declaration
	static Scanner cin = new Scanner(System.in);
	static final int NUM_INTS = 5;
	
	public static void main(String[] args)
	{
		// declare variables 
		int searchValue = 0;
		int numOccurences = 0;
		int[] numValues = new int[NUM_INTS]; // int array size is initialized with a const value
		
		// display message to screen
		System.out.println("Welcome to My Programming Notes' Java Program.n");		
		
		// get data from user via a 'for loop'
		System.out.println("Please enter "+ NUM_INTS +" integer values:");
		
		for (int index=0; index < NUM_INTS; ++index)
		{
			System.out.print("#" + (index + 1) + ": ");
			numValues[index] = cin.nextInt();
		}
		
		// get a search value from the user
		System.out.print("Please enter a search value: ");
		searchValue = cin.nextInt();
		System.out.println("");		
		
		// finds the number of occurences the search value was found in the array
		numOccurences = SearchArray(numValues, searchValue);
		
		// display data to user
		System.out.println("nThe total occurrences of value "+ searchValue 
			+ " within the array is: " + numOccurences);		
	}// end of main
	
	// ==== SearchArray ===========================================================
	//
	// This method will take as input the array, the number of array 
	// elements, and the target value to search for. The function will traverse 
	// the array looking for the target value, and when it finds it, display the 
	// index location within the array.
	// 
	// Input:
	//	      limit [IN]  -- the array, the number of array 
	//				elements, and the target value
	//
	// Output:
	//	      The total number of occurrences of the target value in the array
	//
	// ============================================================================
	public static int SearchArray(int[] numValues, int searchValue)
	{
		int numFound=0;
		for (int index=0; index < NUM_INTS; ++index)
		{
			if (numValues[index] == searchValue)
			{
				System.out.println("t" + searchValue + " was found at array " +
						"index #" + index);
				++numFound; // if the search values was found,
				           // increment the variable by 1
			}
		}
		return numFound;
	}
}// http://programmingnotes.org/

QUICK NOTES:
The highlighted lines are sections of interest to look out for.

The code is heavily commented, so no further insight is necessary. If you have any questions, feel free to leave a comment below.

Once compiled, you should get this as your output:
Note: The code was compiled 3 separate times to display the different outputs its able to produce

====== RUN 1 ======
Welcome to My Programming Notes' Java Program. Please enter 5 integer values: #1: 25 #2: 25 #3: 25 #4: 25 #5: 25 Please enter a search value: 25 25 was found at array index #0 25 was found at array index #1 25 was found at array index #2 25 was found at array index #3 25 was found at array index #4 The total occurrences of value 25 within the array is: 5 ====== RUN 2 ====== Welcome to My Programming Notes' Java Program. Please enter 5 integer values: #1: 8 #2: 19 #3: 97 #4: 56 #5: 8 Please enter a search value: 8 8 was found at array index #0 8 was found at array index #4 The total occurrences of value 8 within the array is: 2 ====== RUN 3 ====== Welcome to My Programming Notes' Java Program. Please enter 5 integer values: #1: 78 #2: 65 #3: 3 #4: 45 #5: 89 Please enter a search value: 12
The total occurrences of value 12 within the array is: 0

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Posted in: Console, Java, Java, Snippets Tags: array, Count, for loop, java, search, Total

Java || Searching An Integer Array For A Target Value

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