Given two integers n1 and n2, the task is to concatenate these two integers into one integer.
Example:
Input: n1 = 12, n2 = 34 Output: 1234 Input: n1 = 1, n2 = 93 Output: 193
Approach: The simplest approach to do this is:
- Convert both numbers to string
- Concatenate both strings into one, as this is comparatively easy
- Convert this concatenated string back to integer
Program:
C++
// CPP program to concatenate // two integers into one #include <iostream> #include <string> using namespace std; // Function to concatenate // two integers into one int concat(int a, int b) { // Convert both the integers to string string s1 = to_string(a); string s2 = to_string(b); // Concatenate both strings string s = s1 + s2; // Convert the concatenated string // to integer int c = stoi(s); // return the formed integer return c; } int main() { int a = 23; int b = 43; cout << concat(a, b) << endl; return 0; } // This code is contributed by Ayush Singla(@ayusin51) |
C
// C program to concatenate // two integers into one #include <stdio.h> #include <string.h> #include <stdlib.h> // Function to concatenate // two integers into one int concat(int a, int b) { char s1[20]; char s2[20]; // Convert both the integers to string sprintf(s1, "%d", a); sprintf(s2, "%d", b); // Concatenate both strings strcat(s1, s2); // Convert the concatenated string // to integer int c = atoi(s1); // return the formed integer return c; } int main() { int a = 23; int b = 43; printf("%d\n", concat(a, b)); return 0; } // This code is contributed by Ayush Singla(@ayusin51) |
Java
// Java program to concatenate // two integers into one public class GFG { // Function to concatenate // two integers into one static int concat(int a, int b) { // Convert both the integers to string String s1 = Integer.toString(a); String s2 = Integer.toString(b); // Concatenate both strings String s = s1 + s2; // Convert the concatenated string // to integer int c = Integer.parseInt(s); // return the formed integer return c; } public static void main(String args[]) { int a = 23; int b = 43; System.out.println(concat(a, b)); } } |
Python3
# Python3 program to concatenate # two integers into one # Function to concatenate # two integers into one def concat(a, b): # Convert both the integers to string s1 = str(a) s2 = str(b) # Concatenate both strings s = s1 + s2 # Convert the concatenated string # to integer c = int(s) # return the formed integer return c # Driver code a = 23b = 43 print(concat(a, b)) # This code is contributed by shubhamsingh10 |
C#
// C# program to concatenate // two integers into one using System; class GFG { // Function to concatenate // two integers into one static int concat(int a, int b) { // Convert both the integers to string String s1 = a.ToString(); String s2 = b.ToString(); // Concatenate both strings String s = s1 + s2; // Convert the concatenated string // to integer int c = int.Parse(s); // return the formed integer return c; } // Driver code public static void Main(String []args) { int a = 23; int b = 43; Console.WriteLine(concat(a, b)); } } /* This code contributed by PrinciRaj1992 */ |
Javascript
<script> // JavaScript program to concatenate // two integers into one // Function to concatenate // two integers into one function concat(a , b) { // Convert both the integers to string var s1 = a.toString(); var s2 = b.toString(); // Concatenate both strings var s = s1 + s2; // Convert the concatenated string // to integer var c = parseInt(s); // return the formed integer return c; } var a = 23; var b = 43; document.write(concat(a, b)); // This code contributed by Rajput-Ji </script> |
Output:
2343
Time Complexity: O(d1+d2) where d1=log10(a) and d2=log10(b)
Auxiliary Space: O(d1+d2)
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