C++ Program to Concatenate Two Strings

#include<iostream>
using namespace std;
int main()
{
char str1[30],str2[30],str3[60];
int i,j;
cout<<"Enter first string:";
gets(str1);
cout<<"\nEnter second string:";
gets(str2);
for(i=0;str1[i]!='\0';++i)
str3[i]=str1[i];
for(j=0;str2[j]!='\0';++j)
str3[i+j]=str2[j];
str3[i+j]='\0';
cout<<"\nThe concatenated string is "<<str3;
return 0;
}