Literal constants, like variables, are considered to have a specific data type. By default, integer literals are of type int. However, we can force them to either be unsigned by appending the u character to it, or long by appending l:
75 // int
75u // unsigned int
75l // long
75ul // unsigned long
I underlined what I dont understand. I know unsigned means that its a positive or negative but what does long mean
I also have another question. After reading a tutorial, I was supposed to put this code into the thing:
#include <iostream>
using namespace std;
#define PI 3.14159
#define NEWLINE '/n';
int main() {
double r=5.0;
double circle;
circle = 2*PI*r;
cout << circle;
cout << NEWLINE;
return 0;
}
The only thing I dont understand is the double part. Whats that mean
Im confused about this.
Ovesen
Try VC++ Help | Index search on "double data type". There's far more in the Help for VC++ 2005 Express Edition. It's a great resource.
You can download free electronic books on C++ too (see http://forums.microsoft.com/MSDN/ShowPost.aspx PostID=446165&SiteID=1), and there are some very affordable tutorial style books at major bookstores. I think that will go much faster for you than waiting for answers here.
I recommend C++ Programming in Easy Steps and C++ DeMystified: A Self-Teaching Guide. Start there and it will help you develop your sense of what more-advanced materials suit your interests, such as the books identified in a post on Resources for Beginners.
- Dennis
Ben Andrews
unsigned means it's only positive. long and int are the same thing, but different types in theory ( long should be bigger )
LuisNeto