C program to join two strings without using strcat

C program to join two strings without using the string library function "strcat" :

Here's the code :-

// Program to concate/join two strings

#include<stdio.h>

#include<string.h>

main()

{

int i,j,n=0;

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

printf("Enter string 1:\n");

gets(str);

printf("Enter string 2:\n");

gets(str2);

for(i=0;str[i]!='\0';i++)

{

str3[i]=str[i];

n=n+1;

}

for(i=0,j=n;str2[i]!='\0';i++,j++)

{

str3[j]=str2[i];

}

str3[j]='\0';

printf("The concanted sring is: \n");

puts(str3);

}