Help needed on visual C++ basic math program

xoBeBExo · #1 17-Nov-2005, 20:35

Hi Guys,

I am using Visual Basic C++ 6.0 edition.

I need help on creating a basic program that can:

1. Add

2. Subtract

3. Multiply

4. Division

It should take no longer than 10 minutes if you are C++ savy.

--------------------

Use float

The screen should prompt user to enter two numbers:

Enter a number:

Enter a number:

Result of Addition =

Result of Subtraction =

Result of Multiplying =

Result of Division =

xoBeBExo

where you guys from?

Paramesh · #2 17-Nov-2005, 21:29

Hi xoBeBExo,

Welcome to the GIDForums™.

Did you read the Guidelines?

There are many people from many countries in this forum. You can look forward to meet them in this forum and have a enjoyable stay.

I am from India.
Where are you from?

Since you mentioned that you use Visual C++, i assume that you use C++ programming language.

Ok. Lets start thinking how to do this program.

Quote:

I need help on creating a basic program that can:

1. Add

2. Subtract

3. Multiply

4. Division

Lets start from a simple program.
I hope you know:
1. Every executable program should have a main function:

CPP / C++ / C Code:

int main()
{

return 0;
}

at the end to indicate successful execution.
2. We should include the iostream header file using :

CPP / C++ / C Code:

#include<iostream>

3. We should include the line:

CPP / C++ / C Code:
using namespace std;
to indicate that we are going to use the statements from the namespace std;(you'll know what are namespaces later..)
4. We can add comments using //. Comments help in understanding the program better.

So, here is the prototype of a typical C++ program:

CPP / C++ / C Code:

#include<iostream>     //include the iostream standard library
using namespace std;  //use the namespace std.

int main()                  //the main function. should return int.
{                             //open the braces 

    //statements go here...

    return 0;               //return 0 indicates successful execution.
}                            //close the braces

Now, we have created a prototype.

We shall see next, how to use variables to store numbers and print them.

CPP / C++ / C Code:

#include<iostream>
using namespace std;

int main()
{
    int i;          //int represents integer. create a variable i.
    i = 5;         //store the value of 5 in i.
   
    cout << "The number is " << i ;   //print the value of i

    return 0;
}

As you see the comments, we create an integer say i and then store some value in the integer.
The we are printing by using the cout statement.
So, cout<<"The number is " will print "The number is " and "<< i;" prints the number i.
Try this program in your visual C++.

Next, we'll see how to manipulate variables. Say addition first.

CPP / C++ / C Code:

#include<iostream>
using namespace std;

int main()
{
    float num1, num2;           //two variables to store numbers
    float sum;                      //this variable stores the sum
    
    num1 = 5;                      //store some value in the numbers.
    num2 = 10;
    sum = num1 + num2;       //calculate the sum and store it in sum.
    
    cout << "The sum is " << sum ;    //print sum

    return 0;
}

Since you have to use floats, we declare three variables say num1, num2 and sum.
the store some value in the numbers and add them using the addition symbol "+" and store the sum in the variable sum.
so,

CPP / C++ / C Code:
sum = num1 + num2;
represents we are adding num1 and num2 and then store the result in sum..

Now, how to get the user input?
We can use the cin statement..
Here is the sample program.

CPP / C++ / C Code:

#include<iostream>
using namespace std;

int main()
{
    float num1, num2;           //two variables to store numbers
    float sum;                      //this variable stores the sum
    
    cout<<"Enter the number 1 ";
    cin >> num1;                  //get the user input for num1

    cout<<"Enter the number 2 ";
    cin >> num2;                  //get the user input for num2


    sum = num1 + num2;       //calculate the sum and store it in sum.
    
    cout << "The sum is " << sum ;    //print sum

    return 0;
}

So, cin >> num1 waits for the user to enter a number and then stores the number in num1. We do similarly for num2 and then we add them and print the sum.

Here is a sample output from the program:

Code:

Enter the number 1 10 Enter the number 2 20 The sum is 30

So, we have successfully created a program that adds two numbers and print the sum.

Now, here is what you should do for subtraction, multiplication and division:
1. Create separate variables to store the result of subtraction, multiplication and division.
2. Get the input for the two numbers.
3. Do the corresponding action for subtraction, multiplication and division and then store it in variables. i.e num1 - num2 for subtraction etc..
4. Print the result.

Best Regards,

Paramesh.

alcoholic · #3 18-Nov-2005, 00:09

nicely explained paramesh

Paramesh · #4 18-Nov-2005, 00:42

Quote:

Originally Posted by alcoholic

nicely explained paramesh

Thank You alcoholic(are you?

)

and Welcome to the GIDForums™.

Best Regards,
Paramesh.

kobi_hikri · #5 18-Nov-2005, 01:48

Quote:

Originally Posted by Paramesh

I am from India.

Not just India ! I've read you are from Madras (or Fort St. George) !

Paramesh · #6 18-Nov-2005, 01:52

Quote:

Originally Posted by Kobi

Not just India ! I've read you are from Madras (or Fort St. George) !

Not Madras. The name has changed to Chennai(tamil word).

Fort St. George is in Chennai.

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Help needed on visual C++ basic math program

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