write a c++ program to accept details from user (max 10) and change input phone number to new phone number using following criteria:

/*
create a class phone having data member:
1.the STD code
2.the exchange code
3.phone number
ex:-212-766-8901
write a c++ program to accept details from user (max 10) and change
input phone number to new phone number using following criteria:
a) add 1 to 1st digit of STD code(if digit is 9 it becomes 10)
b) the exchange code is retain as it is.
c) in third part of structure 1st two digit should be reverse
display all changes phone numbers.
*/
#include<iostream.h>
#include<conio.h>
#include<string.h>
class phone
{
long int std,ex;
char ph[20];
public:void accept()
       {
       cout<<"\nenter STD code:-";
       cin>>std;
       cout<<"\nenter exchange code:-";
       cin>>ex;
       cout<<"\nenter phone number:-";
       cin>>ph;
       }
       void display()
       {
       cout<<"\n"<<std<<"\t"<<ex<<"\t\t"<<ph;
       }
       void change();

};
void phone::change()
       {
       long int ans=0;
       int n;
       while(std>0)
       {
       n=std%10;
       std=std/10;
       if(std==0)
       ans=(ans*10)+(n+1);
       else
       ans=(ans*10)+n;
       }
       std=0;
       while(ans>0)
       {
       n=ans%10;
       ans=ans/10;
       std=(std*10)+n;
       }
       int c=ph[0];
       ph[0]=ph[1];
       ph[1]=c;
       }
int main()
{
phone p[3];
clrscr();
for(int i=0;i<3;i++)
p[i].accept();
for(i=0;i<3;i++)
p[i].change();
cout<<"\nSTDcode exchangecode  phonenumber";
for(i=0;i<3;i++)
p[i].display();
getch();
return 0;
}
/*

enter STD code:-2312

enter exchange code:-6787

enter phone number:-45

enter STD code:-79078

enter exchange code:-456

enter phone number:-67854

enter STD code:-45643

enter exchange code:-222

enter phone number:-456

STDcode exchangecode  phonenumber
3312    6787            54
89078   456             76854
55643   222             546
*/