Girfa : Student Help: String Concatenation without library function

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

#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();

}