Hey guys in c++ there are alot of data types and I was just wondering are items such as long, long double, signed long and unsigned short declared as:
long double variableName;
or do they have to be declared like?
long double int variableName;
long double char variableName;
unsigned short int variableName;
unsigned shot char variableName;
Last edited by 182; 02-17-2006 at 07:27 PM.
A double is a different type than an int or a char. You can't declare a variable as a double int or double char.
The long keyboard can be used to declare a larger integer, or a high precision double:
long int i;
long double d;
Keep in mind that this is implementation defined though. On many systems a long int and a long double are no different than a regular int/double.
The keywords signed/unsigned can be placed before a type declaration to specify if the variable can hold negative numbers (signed), or positive numbers only (unsigned).
Thanks, I also believe there is a signed, unsigned and short are these just for ints or are they for chars as well? Thanks.
The only 4 variable types you need to be concerned with are:
1) int--------whole numbers
2) double----numbers with decimal points
3) char------one letter or symbol enclosed in single quotes
4) string-----one or more letters or symbols enclosed in double quotes
Last edited by 7stud; 02-17-2006 at 08:47 PM.
Well, signed and unsigned are for numbers, and short is for a short number. Signed is for negative numbers only and unsigned is for positive numbers only. A regular int has a range of about -2 million to +2 million. Therefore, if you have an unsigned number (positive only) will increase it to about +4 million, since there isn't a need for negative numbers. Same goes for signed. These are strictly for numbers, no characters can be dealt with these data types.
You can have a signed and unsigned char but not a short char. short is used before int.Originally Posted by 182
What about bool, wchar_t, and float?The only 4 variable types you need to be concerned with are:
5) bool-----has the value true or false
7. It is easier to write an incorrect program than understand a correct one.
40. There are two ways to write error-free programs; only the third one works.*
Just a clarification: signed numbers have a sign associated with them - i.e. an indicator of whether the number is positive or negative - so the equivalent range for the same storage size is halved. So no, signed numbers are not for negative numbers only; they're for both.
And signed chars are possible... though I'm not sure in what case you'd actually want to use them.
Cheers,
Jeff
psychobrat at gmail
2 billion, not million... from -2,147,483,648 to 2,147,483,647 exactly but this of course depends on the processor you use.range of about -2 million to +2 million
