Program to find absolute value of a given number
Given an integer N, the task is to find the absolute value of the given integer.
Examples:
Input: N = -6
Output: 6Input: N = 12
Output: 12
Method 1 – Naive Approach: Since the absolute value of any number is always positive. For any positive number, the absolute value is the number itself and for any negative number, the absolute value is (-1) multiplied by the negative number.
C++
// C++ program for Method 1 #include <bits/stdc++.h> using namespace std; // Function to find the absolute value void findAbsolute(int N) { // If the number is less than // zero, then multiply by (-1) if (N < 0) { N = (-1) * N; } // Print the absolute value cout << " " << N; } // Driver Code int main() { // Given integer int N = -12; // Function call findAbsolute(N); return 0; } // This code is contributed by shivanisinghss2110 |
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C
// C program for Method 1 #include <stdio.h> // Function to find the absolute value void findAbsolute(int N) { // If the number is less than // zero, then multiply by (-1) if (N < 0) { N = (-1) * N; } // Print the absolute value printf("%d ", N); } // Driver Code int main() { // Given integer int N = -12; // Function call findAbsolute(N); return 0; } |
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Java
// Java program for Method 1 class GFG{ // Function to find the absolute value static void findAbsolute(int N) { // If the number is less than // zero, then multiply by (-1) if (N < 0) { N = (-1) * N; } // Print the absolute value System.out.printf("%d ", N); } // Driver Code public static void main(String[] args) { // Given integer int N = -12; // Function call findAbsolute(N); } } // This code is contributed by 29AjayKumar |
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Python3
# Python3 program for Method 1 # Function to find the absolute value def findAbsolute(N): # If the number is less than # zero, then multiply by (-1) if (N < 0): N = (-1) * N; # Print the absolute value print(N); # Driver code if __name__ == '__main__': # Given integer N = -12; # Function call findAbsolute(N); # This is code contributed by amal kumar choubey |
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C#
// C# program for Method 1 using System; using System.Collections.Generic; class GFG{ // Function to find the absolute value static void findAbsolute(int N) { // If the number is less than // zero, then multiply by (-1) if (N < 0) { N = (-1) * N; } // Print the absolute value Console.Write("{0} ", N); } // Driver Code public static void Main(String[] args) { // Given integer int N = -12; // Function call findAbsolute(N); } } // This code is contributed by sapnasingh4991 |
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Output:
12
Method 2 – Using Bitmasking: Since negative numbers are stored in 2s complement form, to get the absolute value, we have to toggle bits of the number and add 1 to the result. Below are the steps:
- Set the mask as right shift of integer by 31 (assuming integers are stored using 32 bits).
mask = n >> 31
- For negative numbers, above step sets mask as 1 1 1 1 1 1 1 1 and 0 0 0 0 0 0 0 0 for positive numbers. Add the mask to the given number.
mask + n
- XOR of mask +n and mask gives the absolute value.
(mask + n)^mask
C++
// C++ program for Method 2 #include <bits/stdc++.h> using namespace std; #define CHAR_BIT 8 // Function to find the absolute // value void findAbsolute(int N) { // Find mask int mask = N >> (sizeof(int) * CHAR_BIT - 1); // Print the absolute value // by (mask + N)^mask cout << ((mask + N) ^ mask); } // Driver Code int main() { // Given integer int N = -12; // Function call findAbsolute(N); return 0; } // This code is contributed by Code_Mech |
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C
// C program for Method 2 #include <stdio.h> #define CHAR_BIT 8 // Function to find the absolute // value void findAbsolute(int N) { // Find mask int mask = N >> (sizeof(int) * CHAR_BIT - 1); // Print the absolute value // by (mask + N)^mask printf("%d ", (mask + N) ^ mask); } // Driver Code int main() { // Given integer int N = -12; // Function call findAbsolute(N); return 0; } |
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Java
// Java program for Method 2 class GFG{ static final int CHAR_BIT = 8; // Function to find the absolute value static void findAbsolute(int N) { // Find mask int mask = N >> (Integer.SIZE / 8 * CHAR_BIT - 1); // Print the absolute value // by (mask + N)^mask System.out.printf("%d ", (mask + N) ^ mask); } // Driver Code public static void main(String[] args) { // Given integer int N = -12; // Function call findAbsolute(N); } } // This code is contributed by 29AjayKumar |
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Python3
# Python3 program for Method 2 import sys CHAR_BIT = 8; # Function to find the absolute value def findAbsolute(N): # Find mask mask = N >> (sys.getsizeof(int()) // 8 * CHAR_BIT - 1); # Print the absolute value # by (mask + N)^mask print((mask + N) ^ mask); # Driver Code if __name__ == '__main__': # Given integer N = -12; # Function call findAbsolute(N); # This code is contributed by 29AjayKumar |
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C#
// C# program for Method 2 using System; class GFG{ static readonly int CHAR_BIT = 8; // Function to find the absolute value static void findAbsolute(int N) { // Find mask int mask = N >> (sizeof(int) / 8 * CHAR_BIT - 1); // Print the absolute value // by (mask + N)^mask Console.Write((mask + N) ^ mask); } // Driver Code public static void Main(String[] args) { // Given integer int N = -12; // Function call findAbsolute(N); } } // This code is contributed by 29AjayKumar |
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Output:
12
Method 3 – Using inbuilt abs() function: The inbuilt function abs() in stdlib.h library finds the absolute value of any number.
Below is the implementation of the above approach:
C++
// C++ program for Method 3 # include<bits/stdc++.h> using namespace std; // Function to find the absolute // value void findAbsolute(int N) { // Find absolute int X = abs(N); // Print the absolute value cout << X; } // Driver Code int main() { // Given integer int N = -12; // Function call findAbsolute(N); return 0; } // This code is contributed by Nidhi_biet |
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C
// C program for Method 3 #include <stdio.h> #include <stdlib.h> // Function to find the absolute // value void findAbsolute(int N) { // Find absolute int X = abs(N); // Print the absolute value printf("%d ", X); } // Driver Code int main() { // Given integer int N = -12; // Function call findAbsolute(N); return 0; } |
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Java
// Java program for Method 3 class GFG{ // Function to find the absolute // value static void findAbsolute(int N) { // Find absolute int X = Math.abs(N); // Print the absolute value System.out.printf("%d", X); } // Driver Code public static void main(String[] args) { // Given integer int N = -12; // Function call findAbsolute(N); } } // This code is contributed by sapnasingh4991 |
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Python3
# Python3 program for Method 3 import math # Function to find the absolute # value def findAbsolute(N): # Find absolute X = abs(N); # Print the absolute value print(X); # Driver Code # Given integer N = -12; # Function call findAbsolute(N); # This code is contributed by Nidhi_biet |
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C#
// C# program for Method 3 using System; class GFG{ // Function to find the absolute // value static void findAbsolute(int N) { // Find absolute int X = Math.Abs(N); // Print the absolute value Console.Write("{0}", X); } // Driver Code public static void Main(String[] args) { // Given integer int N = -12; // Function call findAbsolute(N); } } // This code is contributed by 29AjayKumar |
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Output:
12
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