String Concatenation without library function | C Language

Q : Write a program to concatenate two strings. (Do not use inbuilt string function).

Answer : 

#include<stdio.h>

#include<conio.h>

/*============================

     Girfa Student Help

     Concatenation string

==============================*/

void main()

{

     char ar1[20],ar2[20],ar3[40];

     int i,j;

     printf("Enter first string>> ");

     gets(ar1);

     printf("Enter Second string>> ");

     gets(ar2);

     for(i=0;ar1[i]!='\0';i++)

          ar3[i]=ar1[i];

     for(j=0;ar2[j]!='\0';j++,i++)

          ar3[i]=ar2[j];

     ar3[i]='\0';

     printf("\nFirst string is %s",ar1);

     printf("\nSeocnd string is %s",ar2);

     printf("\nConcatenation string is %s",ar3);

     getch();

}

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