string manipulation using a c++ program

#include
#include
#include
void main()
{
char s1[10],s2[10],s3[10];
int opt;
char choice='y';
clrscr();
while(choice=='y')
{
cout<<"\n Menu\n\n1. string length\n2. string copy\n3. string concadenation\n4. string comparison\n5.exit";
cout<<"\n enter your choice:";
cin>>opt;
switch(opt)
{
case 1:
cout<<"\n enter a name:";
cin>>s3;
cout<<"\n the length of the string is:"<break;
case 2:
cout<<"\n enter a name:";
cin>>s1;
cout<<"\n the original string is :"<strcpy(s2,s1);
cout<<"\n the copied string is:"<break;
case 3:
cout<<"\n enter two names:";
cin>>s1>>s2;
cout<<"\n concatenated string is:"<break;
case 4:
cout<<"\n enter two names:";
cin>>s1>>s2;
if(strcmp(s2,s1)=='\0')
{
cout<<"\n the string are equal";
}
else
{
cout<<"\n the strings are not equal";
}
break;
default:
cout<<"enter number from 1 to 4";
break;
}
cout<<"\n do you want to continue(y/n)"<cin>>choice;
}
getch();
}