DELHI : 2003
3.c) Evaluate the following postfix expression using a stack and show the contents of stack after execution of each operation: 20, 45, +, 20, 10, -, 15, +, *.
Ans) Children, Try this answer as an.
3.e) Consider the following portion of a
program, which implements passengers
Queue for a train. Write the definition of
function. Insert (whose prototype is shown
below); to insert a new node in the queue with
required information.
struct NODE
{ long Ticketno;
char
PName[20];//Passengers Name
NODE * Next;
};
class Queueoftrain
{ NODE * Rear, * Front;
public :
Queueoftrain( ) { Rear = NULL; Front = NULL:}
void Insert( );
void Delete( );
~Queueoftrain( );
} ;
Solution:
void Queueoftrain::Insert( )
{ NODE *ptr;
ptr=new NODE;
if(ptr= = NULL)
{
cout<<”\nNo memory to create a new node….”;
exit(1);
}
cout<<”\nEnter the Ticket Number….”;
cin>>ptr → Ticketno;
cout<<”\nEnter the Passenger Name..”;
gets(ptr → PName);
ptr → Next=NULL;
if(rear= = NULL)
front=rear=ptr;
else
{
rear → Next=ptr;
rear=ptr;
}
}
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