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C array question.

post #1 of 12
Thread Starter 
I thought my professor said that you cannot declare the size of an array with a variable. ex.
int elements = 5;
unsigned a[elements];
I just tried that in my program and it worked. I am curious if I misunderstood my professor or if it is allowing it because I'm using visual c++ as a compiler and that method is legal in c++. Thanks!

Kyle
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post #2 of 12
Older compilers don't support it, but it is valid syntax (they were added to the C language in C99).

This snippet is completely acceptable:

Code:
float ReadAndDoSomething( int n )
{
    float vals[ n ];
 
    for ( int i = 0; i < n; i++ )
    {
        vals[ i ] = Read();
    }

    return DoSomething( vals, n );
}
http://www.cplusplus.com/forum/beginner/1601/

Visual C++ does. You're good to go.

C++ has dynamic arrays anyway (like you'll see in the link above).

Although I don't recommend using variables unless you need to.... use a macro instead.
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post #3 of 12
Quote:
Originally Posted by Kyleinator View Post
I thought my professor said that you cannot declare the size of an array with a variable. ex.
int elements = 5;
unsigned a[elements];
I just tried that in my program and it worked. I am curious if I misunderstood my professor or if it is allowing it because I'm using visual c++ as a compiler and that method is legal in c++. Thanks!

Kyle
I believe it's legit if you make that int 'const'

const int elements = 5;

However what kind of array is that? Unsigned what? Surely that didn't compile.
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post #4 of 12
Quote:
Originally Posted by lordikon View Post
I believe it's legit if you make that int 'const'

const int elements = 5;

However what kind of array is that? Unsigned what? Surely that didn't compile.
Doesn't need to be const.

It is an unsigned int. It will expand to "unsigned int" if you just write "unsigned". See http://en.cppreference.com/w/cpp/language/types

Remember he is using Visual C++ compiler, so the rules are different, but C99 will happily accept a variable length array declaration.
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post #5 of 12
Quote:
Originally Posted by tompsonn View Post
Doesn't need to be const.

It is an unsigned int. It will expand to "unsigned int" if you just write "unsigned". See http://en.cppreference.com/w/cpp/language/types

Remember he is using Visual C++ compiler, so the rules are different, but C99 will happily accept a variable length array declaration.
Ick, I've never seen someone omit the 'int', seems like poor form. Good to know though, thanks for the link.
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post #6 of 12
Quote:
Originally Posted by lordikon View Post
Ick, I've never seen someone omit the 'int', seems like poor form. Good to know though, thanks for the link.
Definitely agree! I've never done it either, it'll easily become confusing!
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post #7 of 12
Strictly speaking, the compiler needs to know on compile time what the array size is. In other words, constants are fine.

int size = 100;

unsigned int array[size]; <- OK

int size = getSizeFromUser(); <- not ok

Most people program in ANSI C and not C99, in which case variable-based arrays won't work - the compiler won't do your dirty work for you.
Edited by Coma - 10/7/11 at 1:22am
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post #8 of 12
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I am just a student taking a C course but my professor always declares as just "unsigned" not "unsigned int." Would it be better if I included the int for unsigneds? Also thanks for answering my question.
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post #9 of 12
Quote:
Originally Posted by Kyleinator View Post
I am just a student taking a C course but my professor always declares as just "unsigned" not "unsigned int." Would it be better if I included the int for unsigneds? Also thanks for answering my question.
Definitely, in my years I've never seen someone just use 'unsigned', especially since there are 'unsigned __int64' and 'unsigned char' as well. I'm almost always explicit with my code, when things are implicit I find it harder to read sometimes, and more prone to error.
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post #10 of 12
Quote:
Originally Posted by lordikon View Post
Definitely, in my years I've never seen someone just use 'unsigned', especially since there are 'unsigned __int64' and 'unsigned char' as well. I'm almost always explicit with my code, when things are implicit I find it harder to read sometimes, and more prone to error.
Then you're not going to like C#'s implicit casting !
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Ol' Sandy
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"Zeus"
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Elite Preview
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CPUMotherboardGraphicsRAM
Intel Xeon E3-1230v3 Gigabyte GA-Z97X-UD5H-BK MSI Gaming GTX 980 Kingston 32GB (4x8) 
Hard DriveHard DriveHard DriveHard Drive
Plextor PX-256M5S 256GB Samsung EVO 1TB Hitachi HDS721010CLA332 Hitachi HDS723020BLA642 
Hard DriveHard DriveHard DriveOptical Drive
Hitachi HDS723020BLA642 Hitachi HUA722010CLA330 WDC WD10EARS-00Z5B1 TSSTcorp CDDVDW SH-S223B 
CoolingCoolingOSMonitor
Phanteks PH-TC14PE with TY-140's Lamptron FCv5 (x2) Windows 8 Pro 64-bit Dell U2412M 
MonitorMonitorMonitorKeyboard
Dell U2412M Dell U2212HM Dell U2713HM Topre Realforce 87UB | Ducky DK9087 G2 Pro 
PowerCaseMouseMouse Pad
Corsair AX-750 Corsair Obsidian 650D Logitech G700 XTRAC Ripper XXL 
AudioAudioAudioAudio
Beyerdynamic DT-770 Pro 250ohm Schiit Bifrost DAC Schiit Asgard 2 HiVi Swan M50W 2.1 
CPUMotherboardRAMHard Drive
Intel Xeon E5-2620 Super Micro X9SRL-F-B 128GB 1333MHz LSI 9271-8i 
OSPowerCase
VMware ESXi 5.5 SeaSonic SS-400FL2 Fractal Define R3 
CPUMotherboardGraphicsRAM
Intel Core i5-3437U HP EliteBook Folio 9470m  Intel HD Graphics 4000  16GB DDR3 SDRAM 
Hard DriveOS
256GB SSD Windows 10 Insider Preview 
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