using System;
namespace system
{
class reverse
{
static void Main(String[] args)
{
int a=721, rev=0, b;
//condition to check if the number is not 0
while(a!=0)
{
b=a%10; //extract a digit
rev=(rev*10)+b; //reverse the digits logic
a=a/10; //remained number
}
Console.WriteLine("The reverse of the number is: " +rev);
}
}
}

Output

The reverse of the number is: 127

Explanation:

Inital value of a (input number): a = 721
Inital value of rev = 0
Iteration 1:
b = a%10 → 721%10 = 1
rev = (rev*10)+b → (0*10)+1 = 1
a = a/10 → 721/10 = 72
Iteration 2:
b = a%10 → 72%10 = 2
rev = (rev*10)+b → (1*10)+2 = 12
a = a/10 → 72/10 = 7
Iteration 3:
b = a%10 → 7%10 = 7
rev = (rev*10)+b → (12*10)+7 = 127
a = a/10 → 7/10 = 0
Now, the value of a is "0", condition will be fasle
Output will be 127.

Consider the program:Output

Explanation:

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