C++ Program on Exception Handling

Program 1

#include<iostream>
#include<stdexcept>
using namespace std;
int main()
{
      int a,b,c;
      cout<<"Enter two number";
      cin>>a>>b;
     try
     {
        if(b==0)
              throw(runtime_error("Can not devide by Zero"));
         c=a/b;
         cout<<c;
     }
      catch(const std::exception &e)
     {
        std::cerr << e.what() << '\n';
     }
         c=a-b;
         cout<<"\n"<<c ;
         c=a+b;
         cout<<"\n"<<c ;
         c=a*b;
          cout<<"\n"<<c ;
}

Program 2

#include<iostream>
#include<stdexcept>
using namespace std;
int main()
{
      int a[5],n,i;
      cout<<"Enter the limit of array";
      cin>>n;
     try
     {
      if(n>5)
        throw(runtime_error("Array Index out of bound..."));

      cout<<"Enter  "<<n << "  Elements in array";
      for(i=0;i<n;i++)
         cin>>a[i];

     }
     catch(const std::exception& e)
     {
        std::cerr << e.what() << '\n';
     }
    

     
}

Program 3

#include<iostream>
#include<stdexcept>
using namespace std;
class ATM
{
      private:
        int amount;
     public:
        ATM()   
        {
              amount=0;
        }
      void deposit(int amt)  
      {
        try
        {
              if(amt<=0)            
                throw(invalid_argument("\nInvalid amount for deposit...."));
               amount=amount+amt;
               cout<<"\nAccount Balance: "<<amount;  
        }
        catch(const std::exception& e)
        {
            std::cerr << e.what() << '\n';
        }
     }
     void withd(int amt)
     {
           try
           {
                if(amt>amount)
                       throw(runtime_error("\nInsufficient balance "));
                if(amt<=0)            
                throw(invalid_argument("\nInvalid amount..."));
                amount=amount-amt;
                cout<<"\nAccount Balance: "<<amount;  

           }
           catch(const std::exception& e)
           {
            std::cerr << e.what() << '\n';
           }
 
     }
};   
int main()
{
         int choice,a;
         ATM A;
     do
    {     
       cout<<"\n----------ATM MENU--------------";
       cout<<"\n  1. Deposit";
       cout<<"\n  2. Withdrawal";
       cout<<"\n  3. Exit";
       cout<<"\n---------------------------------";
       cout<<"\n Enter your choice";
       cin>>choice;
      switch(choice)
    {
        case 1: 
        {
             cout<<"\n Enter an amount for deposit";
             cin>>a;
            A.deposit(a);break;
        } 
        case 2: 
        {
            cout<<"\n Enter an amount for withdrawal";
             cin>>a;
            A.withd(a);break;
        } 
        case 3:break;
    }
  }while(choice!=3);

    return 0;
}