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Increment a number without using ++ or +
  • Difficulty Level : Hard
  • Last Updated : 28 Sep, 2018

The task is to Increment a number without using ++ and + operators.

Examples:

Input : 3
Output : 4

Input : 9
Output : 10

The idea is based on the fact that the negative numbers are stored using 2’s complement form. 2’s complement form is obtained by inverting bits and then adding one. So if we invert all bits of given number and apply negative sign, we get the number plus 1.

C++




// CPP program to increment an unsigned
// int using bitwise operators.
#include <bits/stdc++.h>
using namespace std;
  
// function that increment the value.
int increment(unsigned int i)
{
    // Invert bits and apply negative sign
    i = -(~i);
  
    return i;
}
  
// Driver code
int main()
{
    int n = 3;
    cout << increment(n);
    return 0;
}

Java




// Java program to increment 
// an unsigned int using
// bitwise operators.
import java.io.*;
  
class GFG
{
      
// function that increment
// the value.
static long increment(long i)
{
    // Invert bits and 
    // apply negative sign
    i = -(~i);
  
    return i;
}
  
// Driver code
public static void main (String[] args) 
{
    long n = 3;
    System.out.print( increment(n));
}
}
  
// This code is contributed
// by inder_verma.

Python3




# Python3 program to increment 
# an unsigned int using 
# bitwise operators.
  
# function that increment the value.
def increment(i):
    # Invert bits and 
    # apply negative sign
    i = -(~i);
  
    return i;
  
# Driver code
if __name__ == "__main__":
    n = 3;
    print(increment(n));
  
# This code is contributed by mits

C#




// C# program to increment 
// an unsigned int using
// bitwise operators.
using System;
  
class GFG
{
      
// function that increment
// the value.
static long increment(long i)
{
    // Invert bits and 
    // apply negative sign
    i = -(~i);
  
    return i;
}
  
// Driver code
public static void Main () 
{
    long n = 3;
    Console.WriteLine(increment(n));
}
}
  
// This code is contributed
// by inder_verma.

PHP




<?php
// PHP program to increment 
// an unsigned int using 
// bitwise operators.
  
// function that increment the value.
function increment($i)
{
    // Invert bits and 
    // apply negative sign
    $i = -(~$i);
  
    return $i;
}
  
// Driver code
$n = 3;
echo increment($n);
  
// This code is contributed by mits
?>
Output:
4

It also works for characters.
Example:

Input : a
Output : b

Input : o
Output : p

C++




// CPP program to increment an unsigned
// char using bitwise operators.
#include <bits/stdc++.h>
using namespace std;
  
// function that increment the value.
char increment(unsigned char i)
{
  
    // Invert bits and apply negative sign
    i = -(~i);
    return i;
}
  
// Driver code
int main()
{
    char n = 'a';
    cout << increment(n);
    return 0;
}

Java




// Java program to increment 
// an unsigned char using 
// bitwise operators.
class GFG
{
// function that increment the value.
static char increment(char i)
{
  
    // Invert bits and apply
    // negative sign
    int i1 = -(~(int)(i));
    return (char)(i1);
}
  
// Driver code
public static void main(String[] args)
{
    char n = 'a';
    System.out.println(increment(n));
}
}
  
// This code is contributed by mits 

Python3




# Python3 program to increment 
# an unsigned char using
# bitwise operators.
  
# function that increment
# the value.
def increment(i):
  
    # Invert bits and
    # apply negative sign
    i = -(~ord(i));
    return chr(i);
  
# Driver code
n = 'a';
print(increment(n));
      
# This code is contributed by mits 

C#




// C# program to increment 
// an unsigned char using 
// bitwise operators.
class GFG
{
// function that increment the value.
static char increment(char i)
{
  
    // Invert bits and apply
    // negative sign
    int i1 = -(~(int)(i));
    return (char)(i1);
}
  
// Driver code
static void Main()
{
    char n = 'a';
    System.Console.WriteLine(increment(n));
}
}
  
// This code is contributed by mits 

PHP




<?php
// PHP program to increment 
// an unsigned char using
// bitwise operators.
  
// function that increment
// the value.
function increment($i)
{
  
    // Invert bits and
    // apply negative sign
    $i = -(~ord($i));
    return chr($i);
}
  
// Driver code
$n = 'a';
echo increment($n);
      
// This code is contributed by mits 
?>
Output:
b
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