string_operations

#include<iostream>
using namespace std;
int length(string s1)
{
   int i=0;
   while(s1[i]!='\0')
   i++;
   cout<<"length of the string is "<<i<<"\n";	
   return i;	
}
void string_con(string s1)
{
    string s2;
    cout<< "enter the second string to concat  ";
    cin>>s2;
    s2=s1+s2;
    cout<<s2<<"\n";
}
void string_copy(string s1)
{ 
    string s2;
    s2=s1;
    cout<<"s1 is copied to s2 \n ITS VALUE IS = "<<s2<<"\n";
}
void string_reverse(string s1,int len)
{ 
    int i;
	for(i=len-1;i>=0;i--)
	cout<<s1[i];
}
int main(){ 
    int len;
	string s1;
	cout<<"enter the string ";
	cin>>s1;	
	int choice;
  while(1){
    cout<<"\nChoose the string operation,\n";
    cout<<"1. length\n";
    cout<<"2. concatination\n";
    cout<<"3. copy\n";
    cout<<"4. reversing\n";
    cout<<"5. Exit\n";
    cout<<"Enter your choice: ";
    cin>>choice;
    switch (choice) {
      case 1:
      	len=length(s1);
      	break;
      case 2:
        string_con(s1);
        break;
      case 3:
      	string_copy(s1);
      	break;
      case 4:
       string_reverse(s1,len);
	   break;	
      case 5:
        cout<<"Thank You.\n";
        exit(0);
      default:
        cout<<"Invalid input.\n";
        cout<<"Please enter the correct input.\n";	
        }
   }
return 0;
}