Description

If a string is inserted into a text. Then newer string is the collection 
all characters present in both the string.
Example : 
  Input : 
      text : whatthat
      string : is
      index : 4
  
  Output : whatisthat

C/C++

/* C program to insert a string into given string */
//Save it as InsertString.c

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

    char str[100], insertStr[50], newStr[100];
    int i, pos;

    printf("Enter a string : ");
    gets(str);

    printf("Enter a string to be inserted : ");
    gets(insertStr);

    printf("Enter the position at which string to be inserted : ");
    scanf("%d",&pos);

    int j=0;

    
    /*Insert elements of string into new string upto index 
      pos from start */
    
    for(i=0;i<pos;i++){
        newStr[j] = str[i];
        j++;
    }

    
    //Finding length of string to be inserted
    
    int lenInsertStr = strlen(insertStr);

    
    //Insert elements from string to be inserted to new string
    
    for(i=0;i<lenInsertStr;i++){
        newStr[j] = insertStr[i];
        j++;
    }

    
    //Finding length of string
    
    int lengthStr = strlen(str);

    
    //Insert elements from string from index pos to 
      it's length into new string
    
    for(i=pos;i<lengthStr;i++){
        newStr[j] = str[i];
        j++;
    }

    
    //End new string with null character
    
    newStr[j] = '\0';
    
    //Finally print the new String
    
    printf("The new String is %s", newStr);

    return 0;
}

Input:
Enter a string : Sanjay Dutt
Enter a string to be inserted : Sunil
Enter the position at which string to be inserted : 6

Output:
The new String is SanjaySunil Dutt

Java

/* Java program to insert a string into given string */
//Save it as InsertString.java

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

public class InsertString {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
                
        int i, pos;

        System.out.println("Enter a string : ");
        String str = scanner.nextLine();

        System.out.println("Enter a string to be inserted : ");
        String insertStr = scanner.nextLine();

        System.out.println("Enter the position at which string to be inserted : ");
        pos = scanner.nextInt();

        int j=0;

        
        //Converting string str to character array
        
        char strArray[] = str.toCharArray();
        
        
        /* Declaring the new character array of sum of length of 
           string and string to be inserted*/
        
        char newStrArray[] = new char[str.length()+insertStr.length()];
        
        
        //Insert elements of string into new string upto index pos from start
        
        for(i=0;i<pos;i++){
        	newStrArray[j] = strArray[i];
            j++;
        }

        
        //Finding length of string to be inserted
        
        int lenInsertStr = insertStr.length();
        
        
        //Converting string to be inserted to character array
        
        char insertStrArray[] = insertStr.toCharArray();

        
        //Insert elements from string to be inserted to new string
        
        for(i=0;i<lenInsertStr;i++){
        	newStrArray[j] = insertStrArray[i];
            j++;
        }

        
        //Finding length of string
        
        int lengthStr = str.length();

        
        /* Insert elements from string from index pos to it's length 
           into new string */
        
        for(i=pos;i<lengthStr;i++){
        	newStrArray[j] = strArray[i];
            j++;
        }
        
        
    /* Finally print the new string after converting 
       character array into string*/
        
        System.out.println("The new string is : "+ String.valueOf(newStrArray));
    }
}

Input:
Enter a string : 
Sanjay Dutt
Enter a string to be inserted : 
Sunil
Enter the position at which string to be inserted : 
6

Output:
The new string is : SanjaySunil Dutt

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