Description

Append one string to another means copy the content of one string to the end of another string.

C/C++

/* C program to append one string to another string */
//Save it as AppendTwoString.c


#include<stdio.h>
#include<string.h>
int main(){

    char str1[100], str2[100], str3[100];

    printf("Enter first string : ");
    gets(str1);

    printf("Enter second string : ");
    gets(str2);

    int i=0, j=0;

    
    //Traverse first string and copy character by character into third string
    
    while(str1[i]!='\0'){
        str3[j] = str1[i];
        i++;
        j++;
    }

    i=0;
    
    //Traverse second string and copy character by character into third string
    
    while(str2[i]!='\0'){
        str3[j] = str2[i];
        i++;
        j++;
    }

    //End the third string by appending to NULL at end
    str3[j] = '\0';

    printf("The string after append : %s",str3);

    //The library function strcat(str1,str2) concatenates string str2 to str1
    //It is defined in string.h

    strcat(str1, str2);

    printf("\nThe string after append : %s",str1);

    return 0;
}

Input:
Enter first string : Hello
Enter second string : World

Output:
The string after append : HelloWorld
The string after append : HelloWorld

Java

/* Java program to append one string to another string */
//Save it as AppendTwoString.java


import java.io.*;
import java.util.Scanner;

public class AppendTwoString {

    public static void main(String[] args) {
        
        Scanner scanner = new Scanner(System.in);
        
        String str1, str2;
        
        
        System.out.println("Enter first string : ");
        str1 = scanner.nextLine();
        
        System.out.println("Enter second string : ");
        str2 = scanner.nextLine();
        
        int i=0, j=0;
        
        
        //Need to take char array, so that character by character can be copied
        
        char str3[] = new char[str1.length()+str2.length()];
        
        
        //Traverse first string and copy character by character into third string
        
        for(i=0;i<str1.length();i++) {
            
            str3[j] = str1.charAt(i);
            j++;
        }
        
        
        //Traverse second string and copy character by character into third string
        
        for(i=0;i<str2.length();i++) {
            
            str3[j] = str2.charAt(i);
            j++;
        }
        
        
        //Convert char array to string
        
        System.out.println("The string after append : " + String.valueOf(str3));
        
        
        /* In java there are two built in method to concat string
           1)By + (string concatenation) operator
           2)By concat() method
         */
        
        String newStr1 = str1 + str2;
        
        System.out.println("The string after append : " + newStr1);
        
        String newStr2 = str1.concat(str2);
        
        System.out.println("The string after append : " + newStr2);
        
    }
}

Input:
Enter first string : 
Hello
Enter second string : 
World

Output:
The string after append : HelloWorld
The string after append : HelloWorld
The string after append : HelloWorld

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