Swap Numbers Without Using a Temporary Variable
We can also swap numbers without using the temporary variable. Unlike the previous method, we use some mathematical operations to swap the values.
Algorithm
- Assign to b the sum of a and b i.e. b = a + b.
- Assign to a difference of b and a i.e. a = b – a.
- Assign to b the difference of b and a i.e. b = b – a.
C++ Program to Swap Two Numbers Without Using a Temporary Variable.
C++
// C++ program to swap two// numbers without using 3rd// variable#include <bits/stdc++.h>using namespace std;// Driver codeint main(){ int a = 2, b = 3; cout << "Before swapping a = " << a << " , b = " << b << endl; // applying algorithm b = a + b; a = b - a; b = b - a; cout << "After swapping a = " << a << " , b = " << b << endl; return 0;} |
Output
Before swapping a = 2 , b = 3 After swapping a = 3 , b = 2
Complexity Analysis
- Time Complexity: O(1), as only constant time operations are done.
- Space Complexity: O(1), as no extra space has been used.
C++ Program to Swap Two Numbers
Swapping numbers is the process of interchanging their values. In this article, we will learn algorithms and code to swap two numbers in the C++ programming language.