How to swap two numbers without using a temp variable, write code which is free from Integer overflow?
Here we will discuss how to swap two numbers without using a temp variable in C#
Swap two numeric values(like int, float etc) without a temporary variable as follows:
ANS:
a = a + b ;
b = a – b ;
a = a – b ;
We can also use XOR(^) operator for the same :
a = a^b;
b = b^a;
a = a^b;
This is a frequently asked interview question. Let’s look at the implementation in C#.
Without Using temp variable:
class Program
{
static void Main(string[] args)
{
int first, second;
first = 100;
second = 200;
first = first + second;
second = first - second;
first = first - second;
Console.WriteLine(first.ToString());
Console.WriteLine(second.ToString());
Console.ReadLine();
}
}
Output:
200
100
Program to swap numbers using XOR Operator:
ANS:
using System;
class Program
{
static void Main()
{
int first, second;
first = 100;
second = 200;
//swap numbers using XOR
first = second^first;
second = second^first;
first = first^second;
Console.WriteLine("first = " + first);
Console.WriteLine("second = " + second);
}
}
Output:
200
100
Here we will discuss how to swap two numbers without using a temp variable in C#
Swap two numeric values(like int, float etc) without a temporary variable as follows:
ANS:
a = a + b ;
b = a – b ;
a = a – b ;
We can also use XOR(^) operator for the same :
a = a^b;
b = b^a;
a = a^b;
This is a frequently asked interview question. Let’s look at the implementation in C#.
Without Using temp variable:
class Program
{
static void Main(string[] args)
{
int first, second;
first = 100;
second = 200;
first = first + second;
second = first - second;
first = first - second;
Console.WriteLine(first.ToString());
Console.WriteLine(second.ToString());
Console.ReadLine();
}
}
Output:
200
100
Program to swap numbers using XOR Operator:
ANS:
using System;
class Program
{
static void Main()
{
int first, second;
first = 100;
second = 200;
//swap numbers using XOR
first = second^first;
second = second^first;
first = first^second;
Console.WriteLine("first = " + first);
Console.WriteLine("second = " + second);
}
}
Output:
200
100
Here's a simple C# program to swap two numbers using a temporary variable:
using System;
class Program
{
static void Main(string[] args)
{
int a = 5; // First number
int b = 10; // Second number
Console.WriteLine($"Before swapping: a = {a}, b = {b}");
// Swapping logic using a temporary variable
int temp = a;
a = b;
b = temp;
Console.WriteLine($"After swapping: a = {a}, b = {b}");
}
}
This program initializes two variables
a
and b
with values 5 and 10 respectively. Then, it swaps the values of a
and b
using a temporary variable temp
. Finally, it prints out the values of a
and b
before and after swapping.
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