syntax question

[Chris]

can you assign values to variables like:
int x, y, z = 5;
so that x = 5, y = 5, and z = 5?

thanks for any help!

 

[=?ISO-8859-1?Q?=22Nils_O=2E_Sel=E5sdal=22?=]

can you assign values to variables like:
int x, y, z = 5;
so that x = 5, y = 5, and z = 5?

Not in an initializer.

You can however do
int x,y,z;
x = y = z = 5;

 

[Chris]

oh, duh. Thanks

Not in an initializer.

You can however do
int x,y,z;
x = y = z = 5;

 

[jimmy]

Nils O. SelÃ¥sdal 写é“：

Not in an initializer.

But in fact it works in an initializer, at least in my VC++.
int x = y = z = 5;

 

[Philip Potter]

can you assign values to variables like:
int x, y, z = 5;
so that x = 5, y = 5, and z = 5?

thanks for any help!

try:
int x=5, y=5, z=5;

Philip

 

[Thomas Tutone]

Nils O. SelÃ¥sdal 写é“：


But in fact it works in an initializer, at least in my VC++.
int x = y = z = 5;

Only if y and z were already declared.

Try the following on your VC++ and please report back on the results:

int main()
{
int x = y = z = 5;
}

Best regards,

Tom

 

[Philip Potter]

Nils O. SelÃ¥sdal 写é“：


But in fact it works in an initializer, at least in my VC++.
int x = y = z = 5;

That's funny, it doesn't work on my g++. Can we talk about Standard C++ now?

Philip

me@here~% cat tmp.cpp
int main(void) {
int x = y = z = 5;
return 0;
}
me@here~% g++ -ansi -pedantic tmp.cpp -otmp
tmp.cpp: In function `int main()':
tmp.cpp:2: `y' undeclared (first use this function)
tmp.cpp:2: (Each undeclared identifier is reported only once for each
function
it appears in.)
tmp.cpp:2: `z' undeclared (first use this function)

 

[Frederick Gotham]

Chris posted:

can you assign values to variables like:
int x, y, z = 5;
so that x = 5, y = 5, and z = 5?

Your question is ambiguous.

Are you defining objects and initialising them, or are you simply performing
an assignment with previously defined objects?

If the former, then:

int const val=5;

int x=val,y=val,z=val;

If the latter:

z=5;

x=y=z;

(Assignment binds from right to left, so that is equivalent to:

x=(y=z);

 

[jimmy]

Philip Potter 写é“：

That's funny, it doesn't work on my g++. Can we talk about Standard C++ now?

Philip

me@here~% cat tmp.cpp
int main(void) {
int x = y = z = 5;
return 0;
}
me@here~% g++ -ansi -pedantic tmp.cpp -otmp
tmp.cpp: In function `int main()':
tmp.cpp:2: `y' undeclared (first use this function)
tmp.cpp:2: (Each undeclared identifier is reported only once for each
function
it appears in.)
tmp.cpp:2: `z' undeclared (first use this function)

yes , i agree with you.