modulo for floats?

[inkexit]

I'm writing a basic piece of software that will tell me how many shares
of stock I can buy if the shares cost X each and I have Y to spend.

I have it coded as:

int main()
{

float price, investment;

cout << "enter stock price:";
cin >> price;
cout << "enter total amount available to invest:";
cin >> investment;
cout << "you can buy " << investment%price << "shares.";

return 0;
}

but my compiler doesn't like the modulo with floats and wont compile.
Technically I could change them to ints, but stock prices aren't always
rounded to the nearest dollar.

[Artie Gold]

in*****@yahoo.com wrote:

I'm writing a basic piece of software that will tell me how many shares
of stock I can buy if the shares cost X each and I have Y to spend.

I have it coded as:

int main()
{

float price, investment;

cout << "enter stock price:";
cin >> price;
cout << "enter total amount available to invest:";
cin >> investment;
cout << "you can buy " << investment%price << "shares.";

return 0;
}

but my compiler doesn't like the modulo with floats and wont compile.
Technically I could change them to ints, but stock prices aren't always
rounded to the nearest dollar.

Look up `fmod()'.

HTH,
--ag

--
Artie Gold -- Austin, Texas
http://goldsays.blogspot.com
"You can't KISS* unless you MISS**"
[*-Keep it simple, stupid. **-Make it simple, stupid.]

[Andrew Koenig]

<in*****@yahoo.com> wrote in message
news:11**********************@p10g2000cwp.googlegr oups.com...

cout << "enter stock price:";
cin >> price;
cout << "enter total amount available to invest:";
cin >> investment;
cout << "you can buy " << investment%price << "shares."; but my compiler doesn't like the modulo with floats and wont compile.

Why do you think modulo is appropriate here?

[Default User]

in*****@yahoo.com wrote:

I'm writing a basic piece of software that will tell me how many
shares of stock I can buy if the shares cost X each and I have Y to
spend.

I have it coded as:

int main()
{

float price, investment;

cout << "enter stock price:";
cin >> price;
cout << "enter total amount available to invest:";
cin >> investment;
cout << "you can buy " << investment%price << "shares.";

return 0;
}

but my compiler doesn't like the modulo with floats and wont compile.
Technically I could change them to ints, but stock prices aren't
always rounded to the nearest dollar.

It doesn't sound to me like you want % (actually the remainder
operator). Do a division first, then use floor() to get the nearest
whole number of shares less than or equal to that value.

Brian

[Jacek Dziedzic]

in*****@yahoo.com wrote:

I'm writing a basic piece of software that will tell me how many shares
of stock I can buy if the shares cost X each and I have Y to spend.

I have it coded as:

int main()
{

float price, investment;

cout << "enter stock price:";
cin >> price;
cout << "enter total amount available to invest:";
cin >> investment;
cout << "you can buy " << investment%price << "shares.";

return 0;
}

but my compiler doesn't like the modulo with floats and wont compile.
Technically I could change them to ints, but stock prices aren't always
rounded to the nearest dollar.

Prices should not be expressed in floating-point values
because of round-off errors. You'd be better off storing
the prices as integers. If they are not rounded to the
nearest dollar, why not store them as values "in cents"?

HTH,
- J.