Java: Find all Pairs of elements in an array whose sum is equal to a specified number
22. Find pairs with a given sum
Write a Java program to find all pairs of elements in an array whose sum is equal to a specified number.
Pictorial Presentation:
Sample Solution:
Java Code :
// Define a class named Exercise22.
public class Exercise22 {
// Create a static method named pairs_value that takes an integer array and an input number.
static void pairs_value(int inputArray[], int inputNumber) {
System.out.println("Pairs of elements and their sum : ");
// Iterate through the elements of the inputArray.
for (int i = 0; i < inputArray.length; i++) {
// Iterate through the elements following the current i.
for (int j = i + 1; j < inputArray.length; j++) {
// Check if the sum of inputArray[i] and inputArray[j] equals the inputNumber.
if (inputArray[i] + inputArray[j] == inputNumber) {
// Print the pair of elements and their sum.
System.out.println(inputArray[i] + " + " + inputArray[j] + " = " + inputNumber);
}
}
}
}
// The main method for executing the program.
public static void main(String[] args) {
// Call the pairs_value method with a sample array and input number.
pairs_value(new int[]{2, 7, 4, -5, 11, 5, 20}, 15);
// Call the pairs_value method with another sample array and input number.
pairs_value(new int[]{14, -15, 9, 16, 25, 45, 12, 8}, 30);
}
}
Sample Output:
Pairs of elements and their sum : 4 + 11 = 15 -5 + 20 = 15 Pairs of elements and their sum : 14 + 16 = 30 -15 + 45 = 30
Flowchart:
For more Practice: Solve these Related Problems:
- Write a Java program to find all unique pairs in an array whose sum is a prime number.
- Write a Java program to find all pairs of numbers in an array that add up to a given number without using nested loops.
- Write a Java program to find all pairs of numbers in a sorted array that sum to a given value.
- Write a Java program to find all triplets in an array whose sum is equal to a specified number.
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