CPP program for concatenating two strings without using inbuilt library function strcat

How to concatenate two strings using pointer or array. CPP program for concatenating two strings without using inbuilt library function strcat. How to concatenate two strings in cpp/C++/C without using inbuilt in function strcat.Program to concatenate two strings using pointer.

#include<stdio.h>
#include<string.h>
int main()
{
char arr1[20];
printf("Enter a String:\n");
scanf("%s",&arr1);


char arr2[20];
scanf("%s",&arr2);

printf("You entered:%s and %s\n",arr1,arr2);

int i=0,j=0,length=0;

for(i=0;arr1[i]!='\0';i++)
{
    length++;
}

for(i=length,j=0;arr2[j]!='\0';i++,j++)
{
    arr1[i]=arr2[j];
}
arr1[i]='\0';

printf("Concated string is:%s",arr1);
    return 0;
}
/*
Enter a String:
Hello
India
You entered:Hello and India
Concated string is:HelloIndia
*/

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