Programming Forums > Application Development > C++

DaWei · Feb 16th, 2006, 1:08 PM

Bear in mind that switch is not necessarily a substitute for the if/else/elseif type of construct:

Quote:

Originally Posted by MSDN

The C++ switch statement allows selection among multiple sections of code, depending on the value of an expression. The expression enclosed in parentheses, the �controlling expression,� must be of an integral type or of a class type for which there is an unambiguous conversion to integral type.

and

Syntax

case constant-expression : statement

default : statement

The constant-expression in the case label is converted to the type of the controlling expression and is then compared for equality. In a given switch statement, no two constant expressions in case statements can evaluate to the same value.

People often forget this minor detail.

jobobshishkabob · Feb 16th, 2006, 10:12 PM

Quote:

Originally Posted by babbling

Do you mean something like this?

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if( x == y && x == a && x == b && x == c )
{
  // ...
}

yes kind of....

so basically what i need is that and

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if( x != y && x != a && x != b && x != c )
{
  // ...
}

replace the //....

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if( x == y && x == a && x == b && x == c )
{
  // put (variable) on a list
}

or

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if( x != y && x != a && x != b && x != c )
{
  // ignore (variable)
}

all i need to know is how to place it on a list... after that the next page will be like

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cout<<"All contain: \n";
// displays list

two more questions... how to i say "x = whatever"... i know how to say "x = a number" but i need "x = a word"

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int x = (10)
cout<<x;

that method only works with numbers, how do i do it with letters

and one more thing... does && mean "and" or "and/or"

Thanks

Eric the Red · Feb 16th, 2006, 10:59 PM

this guy is so funny ..HAHAHAHAHAHA

quote "Frankly, if you can't express yourself clearly to a human, how do you expect to express yourself clearly to your machine?... "i want to set them all aside in a side in a list." Say that out loud to yourself and see if you "get it." (DaWei)

babbling · Feb 16th, 2006, 11:10 PM

There are different types of variables. The 'int' variable can only hold integers up to a certain value. Some other types of variables are 'char' and 'float'.

A 'char' variable can hold a single, 8-bit (well, 8-bit on almost all current architectures, anyway) character such as the lower-case letter 'a', upper-case 'A' or the question mark '?' symbol.
Example:

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char foo = 'Y';

A 'float' variable can hold irrational numbers like 3.14159 and 2.71828. It has limited precision, but should be enough for most purposes. A 'double' has greater precision.
Example:

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float bar = 3.14159;

A 'string' is a class from the C++ standard library that is capable of holding a string of characters, for example, "a word, or even words separated by spaces and punctuation".
Example program using strings:

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#include <iostream>
#include <string>
using namespace std;
int main()
{
  string name = "babbling";
  cout << name << endl;
  return 0;
}

Don't use '\n' in C++, because it will not work as expected on all platforms. If you use "endl", it will produce nothing more and nothing less than a new line on all platforms.

I recommend you get a good C++ book, because you have a lot of stuff to learn about. "The C++ Programming Language" by Bjarne Stroustrup isn't a very easy read, but it will make you a better C++ programmer than any other book will. Once you have read and understood the basics, it also becomes easier to read.

Good luck!

Jimbo · Feb 16th, 2006, 11:28 PM

Quote:

Originally Posted by babbling

A 'float' variable can hold irrational numbers like 3.14159 and 2.71828.
...
Don't use '\n' in C++, because it will not work as expected on all platforms. If you use "endl", it will produce nothing more and nothing less than a new line on all platforms.

More specifically, doubles and floats hold floating-point values, not just irrational numbers. And endl flushes the stream it is used on, which is a very very minute amount of extra overhead.

Jimbo · Feb 17th, 2006, 3:14 AM

Oh, and && is just strictly and. Use || for or, which is probably what you want, unless you use !=

nnxion · Feb 18th, 2006, 1:23 PM

Quote:

Originally Posted by babbling

Don't use '\n' in C++, because it will not work as expected on all platforms. If you use "endl", it will produce nothing more and nothing less than a new line on all platforms.

Don't babble so much and stick to the facts. Like Jimbo said, endl flushes the stream. Jimbo I don't know what you mean by 'strictly and', just to be clear to the others: && is 'logical AND', whereas & is 'bitwise AND'.

Feb 16th, 2006, 11:10 PM	#14
babbling Newbie Join Date: Feb 2006 Posts: 11 Rep Power: 0	There are different types of variables. The 'int' variable can only hold integers up to a certain value. Some other types of variables are 'char' and 'float'. A 'char' variable can hold a single, 8-bit (well, 8-bit on almost all current architectures, anyway) character such as the lower-case letter 'a', upper-case 'A' or the question mark '?' symbol. Example: (Toggle Plain Text) char foo = 'Y'; char foo = 'Y'; A 'float' variable can hold irrational numbers like 3.14159 and 2.71828. It has limited precision, but should be enough for most purposes. A 'double' has greater precision. Example: (Toggle Plain Text) float bar = 3.14159; float bar = 3.14159; A 'string' is a class from the C++ standard library that is capable of holding a string of characters, for example, "a word, or even words separated by spaces and punctuation". Example program using strings: (Toggle Plain Text) #include <iostream> #include <string> using namespace std; int main() { string name = "babbling"; cout << name << endl; return 0; } #include <iostream> #include <string> using namespace std; int main() { string name = "babbling"; cout << name << endl; return 0; } Don't use '\n' in C++, because it will not work as expected on all platforms. If you use "endl", it will produce nothing more and nothing less than a new line on all platforms. I recommend you get a good C++ book, because you have a lot of stuff to learn about. "The C++ Programming Language" by Bjarne Stroustrup isn't a very easy read, but it will make you a better C++ programmer than any other book will. Once you have read and understood the basics, it also becomes easier to read. Good luck! __________________ Canonical Books: The best programming books around.

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Feb 16th, 2006, 10:59 PM	#13
Eric the Red Hobbyist Programmer Join Date: Feb 2006 Posts: 214 Rep Power: 0	this guy is so funny ..HAHAHAHAHAHA quote "Frankly, if you can't express yourself clearly to a human, how do you expect to express yourself clearly to your machine?... "i want to set them all aside in a side in a list." Say that out loud to yourself and see if you "get it." (DaWei)

Feb 17th, 2006, 3:14 AM	#16
Jimbo Battle Programmer Join Date: Feb 2006 Location: Bellevue, WA, USA Posts: 763 Rep Power: 3	Oh, and && is just strictly and. Use \|\| for or, which is probably what you want, unless you use !=

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Programming Forums > Application Development > C++

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