How to concatenate two Integer values into one?

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

Recommended: Please try your approach on {IDE} first, before moving on to the solution.

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 #include 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 #include #include    // Function to concatenate // two integers into one int concat(int a, int b) {        char s1;     char s2;        // 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));     } }

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 */

Output:

2343

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Improved By : ayusin51, princiraj1992

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