[SOLVED] the problem of struct

chenokay · 08-28-2010, 06:55 AM

my system is slackware,I define a struct like:

typedef struct row{
unsigned int index;
unsigned char* prow;
unsigned int rowlen;
struct row* next;
row(){ //wrong
index=0;
prow=NULL;
rowlen=0;
next=NULL;
}
}srow,*psrow;

When I gcc the code,it give wrong message:
expected specifier-qualifier-list before 'row'
it's right compiling in windows.
looking forward your help.

johnsfine · 08-28-2010, 07:04 AM

Quote:

Originally Posted by chenokay

When I gcc the code

gcc, not g++ ??

Is this C++ code or C code? It seems to be a bad mix of the two.

In C, there are no constructors.

I assume row() was intended to be a constructor for struct row. That line works when you compile your code with g++ rather than gcc.

MTK358 · 08-28-2010, 08:48 AM

You are not allowed to have functions in structs in C. If row was a struct, then get rid or the "()".

kalleanka · 08-29-2010, 02:36 PM

put a function instead of row() like

int(*ptr)(int x, int y)

and then asingn it in your program like

ptr = add;

having a function

int add(int x, int y)
{
return x+y;
}

MTK358 · 08-29-2010, 02:42 PM

Quote:

Originally Posted by kalleanka

ptr = add;

having a function

int add(int x, int y)
{
return x+y;
}

Shouldn't it be "ptr = &add"?

kalleanka · 08-29-2010, 03:17 PM

i think functions are pointers in c
so ptr = add should work. But best is to test it.

Sergei Steshenko · 08-29-2010, 03:44 PM

Quote:

Originally Posted by MTK358

Shouldn't it be "ptr = &add"?

No, WRT functions '&' is not necessary.

Sergei Steshenko · 08-29-2010, 03:48 PM

Quote:

Originally Posted by chenokay

...
it's right compiling in windows.
looking forward your help.

Windows "C" compiler is not the standard, the standard is: http://www.open-std.org/JTC1/SC22/wg...docs/n1124.pdf .

If you think your code is a valid C99 code, show part of the standard on which you base your assumption.

chenokay · 08-30-2010, 08:45 AM

thank all of you, I change the code into c++ format and compile with g++,all is right.