Comments on: 3.2 — Arithmetic operators

By: Random C++ learner

Random C++ learner — Sun, 07 Feb 2010 00:18:36 +0000

#include 


int main()
{
    using namespace std;
    cout << "Make 100 by adding a number to 23: ";
    double dX;
    cin >> dX;

    cout << "23 + " << dX << " Makes " << 23 + dX << endl;

    if (dX == 77)

    cout << "Congratulations you can do basic math." << endl;

    else

    cout << "\aoh dear, i hope you were testing the else statement..." << endl;

    return 0;
}

if the

 if (dX == 77)

is not bracketed, then it does not know what to check/ search for, and therefore won't compile. Although by now, you probably know why anyway. but a bit of practice in explaining anyway... every little helps.

By: BorisTheSpider

BorisTheSpider — Wed, 06 Jan 2010 04:13:04 +0000

I’m using Code::Blocks, and if I run my program from the last chapter’s quiz and enter 0 as the second number (named dY in the example answer) and choose the division sign (/), it doesn’t crash. Rather, it tells me the answer is “Infinity”.

I’m not sure if that’s compiler-specific or what, but I figured it was worth noting.

By: Bob

Bob — Sat, 05 Dec 2009 22:01:38 +0000

I’m using this tutorial to teach myself c++. So far it’s been pretty good. I have a question about arithmetic operators in regard to powers. How does one square or cube or pentuple a number without actually mulitplying the number that many times? In other programing languages one can use the ^ symbol to indicate “raised to the power of” so that a number square could be represented as x^2 and a pentupled number can be represented as x^5.

By: Thom

Thom — Mon, 26 Oct 2009 18:52:45 +0000

Here’s the briefest answer to #2 I could come up with:

bool IsEven(int x)
{
    return !(x % 2);
}

By: See ++

See ++ — Mon, 17 Aug 2009 15:23:06 +0000

#include
using namespace std;

bool IsEven(int x);

int main()
{
	int y;
	cout<<"Enter an integer. The program will check if it is even(1) or odd(0): ";
	cin>>y;

	cout<

By: anand chanduri

anand chanduri — Tue, 04 Aug 2009 04:47:41 +0000

Simplified version of the code

#include 
#define TRUE 1
#define FALSE 0
using namespace std;
int nValue;
int IsEven()  //function to find out if variable nValue entered is odd or even
    {
        return ((nValue%2)>0?FALSE :TRUE);
    }
int main()
    {
        int retVal;
        cout << "Enter Number: " << endl;
        cin >> nValue; // Input a number to find out if it is even or odd
        retVal = IsEven();
        if (retVal == TRUE)
        {
        cout << "Even Number: " << endl;
        }
        else
        {
        cout << "ODD Number: " << endl;
        }
        return 0;
    }

By: Sam

Sam — Mon, 03 Aug 2009 11:40:52 +0000

I got this on first try and it worked.

#include 
using namespace std;
int nValue;
bool IsEven()  //function to find out if variable nValue entered is odd or even
    {
        if (nValue % 2 == 0)
            cout << "EVEN!" << endl;
        else
            cout << "ODD!" << endl;
        return nValue;
    }
int main()
    {
        cout << "Enter Number: " << endl;
        cin >> nValue; // Input a number to find out if it is even or odd
        IsEven();
        return 0;
    }

By: albino_squirrel

albino_squirrel — Tue, 28 Jul 2009 00:47:56 +0000

Whenever I use an if statement it generated an error, then I added curly braces at the beginning and end of each if statement and it started working, do you have any idea why?

By: lfamorim

lfamorim — Wed, 22 Jul 2009 03:45:28 +0000

First of all, I’d like to thank you for the tutorial!

I just want to say that at the title “Modulus (remainer)” there’s a typing error, it should be “Modulus (remainder)”right? :)

By: Chiamaka

Chiamaka — Tue, 16 Jun 2009 00:55:30 +0000

When i tried to compile the program that you made for question 2, it would not compile, there was a problem when it was linking, it said:” 1 unresolved externals”