Concatenate two strings in C++

#include <iostream.h>
#include<conio.h>
#include<string.h>
void main()
{
	char str1[30]="blue";
	char str2[30] = "oceans";
	int i=0,stop;
//to get the last index containing character
do	{
	stop=i++;
}while(str1[i]!='\0');

i=stop+1;
//concate strings
for(int j = 0; str2[j] != '\0'; j++, i++)
	str1[i] = str2[j];	//copying chars of string2 in 1, one by one

str1[i] = '\0';    //to terminate resultant string
cout&lt;&lt;"\n Resultant string is: "&lt;&lt; str1;
getch();

}

Output:

Resultant string is: blueoceans