Programming & Computer Science Answers

Convert an infix expression to its equivalent postfix expression.
Note: The code should have the modularity and should include following functions apart from
main():
 getNextToken(): This functions returns the next token in the input infix expression. The
token may be an operator or “(“ or “)” or an operand. The operands can be of multiple
digits. For example the infix expression 1000/(10+240) contains operands 1000, 10, and
240.
 infixToPostfix(): Converts the input infix expression to postfix. This function calls
getNextToken() repeatedly to get the next token until it reaches the end. The token is
then processed depending on whether it is an operand or operator or ( or ).

Write a program to implement the stack using an array.
Note: The code should have the modularity and should include following function (

Create a class of subtraction having two private data members. Create class methods
to get data from users and for subtraction of data members. Use appropriate access
modifiers for class methods.

#include<iostream>
using namespace std;
class add //Specifies the class
{
private:
int iNum1, iNum2, iNum3; //Member data
public:
void input(int iVar1, int iVar2) //Member function
{
cout<<"Functions to assign values to the member data"<<endl;
iNum1=iVar1;
iNum2=iVar2;
}
void sum(void) //Member function
{
cout<<"Functions to find the sum of two numbers"<<endl;
iNum3=iNum1+iNum2;
}
void disp(void) //Member function
{
cout<<"The sum of the two numbers is "<<iNum3<<endl;
}
};
/////////main function of the program///////////
void main()
{
add A1;
int iX, iY;
cout<<"Input two numbers"<<endl;
cin>>iX;
cin>>iY;
A1.input(iX, iY);
A1.sum();
A1.disp();
system("pause");
}
Code the example given above and include a private constructor in the class. Create
objects of this class. Test the code and write down how the constructor will be called
or unable to be called?

#include<iostream>
using namespace std;
class add //Specifies the class
{
private:
int iNum1, iNum2, iNum3; //Member data
public:
void input(int iVar1, int iVar2) //Member function
{
cout<<"Functions to assign values to the member data"<<endl;
iNum1=iVar1;
iNum2=iVar2;
}
void sum(void) //Member function
{
cout<<"Functions to find the sum of two numbers"<<endl;
iNum3=iNum1+iNum2;
}
void disp(void) //Member function
{
cout<<"The sum of the two numbers is "<<iNum3<<endl;
}
};
/////////main function of the program///////////
void main()
{
add A1;
int iX, iY;
cout<<"Input two numbers"<<endl;
cin>>iX;
cin>>iY;
A1.input(iX, iY);
A1.sum();
A1.disp();
system("pause");
}
Code the example given above and check the errors if you try to access the private
data members in main() function.
Modify the above task by making the scope of public member functions as private.
Create access functions in public scope to access private member functions from
main().

#include<iostream>
using namespace std;
class add //Specifies the class
{
private:
int iNum1, iNum2, iNum3; //Member data
public:
void input(int iVar1, int iVar2) //Member function
{
cout<<"Functions to assign values to the member data"<<endl;
iNum1=iVar1;
iNum2=iVar2;
}
void sum(void) //Member function
{
cout<<"Functions to find the sum of two numbers"<<endl;
iNum3=iNum1+iNum2;
}
void disp(void) //Member function
{
cout<<"The sum of the two numbers is "<<iNum3<<endl;
}
};
/////////main function of the program///////////
void main()
{
add A1;
int iX, iY;
cout<<"Input two numbers"<<endl;
cin>>iX;
cin>>iY;
A1.input(iX, iY);
A1.sum();
A1.disp();
system("pause");
}
Code the example given above and check the errors if you try to access the private
data members in main() function.

Define a function hypotenuse that calculates the length of the hypotenuse of a right triangle when the other two sides are given. Use this function in a program to determine the length of the hypotenuse for each of the following triangles. The function takes two arguments of type double and return the hypotenuse as a double.

Code a method named createVenue(). This method has no parameters, but returns a
Venue object.
Required:
a) Define a Scanner variable to read from the keyboard.
b) Define variables for building name, room number and number of seats. Prompt
the user to type data values for each of the variables and and read the values from
the keyboard.
c) Define and create a Venue object from the data read from the keyboard.
d) Return this Venue object