Initialize an array inside a class

[Hamburgpear]

Dear,

I have a private variable of double array x[100], how can I initialize it to
'\0'? should I create a for loop in the constructor? or I can simply write
double x[100]={'\0'} in my class_name.h file?

Thanks

 

[John Harrison]

Dear,

I have a private variable of double array x[100], how can I initialize it to
'\0'? should I create a for loop in the constructor?

That would work, so would using the standard function fill_n.

#include <algorithm>

....

std::fill_n(x, 100, 0.0);


or I can simply write

double x[100]={'\0'} in my class_name.h file?

That's not legal syntax.

Thanks

john

 

[John Harrison]

Dear,

I have a private variable of double array x[100], how can I initialize
it to '\0'? should I create a for loop in the constructor?

I just read this again, initialise a double array to '\0'. What do you
mean by that? It doesn't make any sense.

john

 

[Hamburgpear]

Dear John,

Yes, you are right, originally, I want to compare the array element so that
I will terminate the loop if array element = '\0'. I just tested it and
found that the loop terminate even it is 0. Any suggestion?

Thanks
Perry

Dear,

I have a private variable of double array x[100], how can I initialize
it to '\0'? should I create a for loop in the constructor?

I just read this again, initialise a double array to '\0'. What do you
mean by that? It doesn't make any sense.

john

 

[makc.the.great]

Yes, you are right, originally, I want to compare the array element so that
I will terminate the loop if array element = '\0'. I just tested it and
found that the loop terminate even it is 0. Any suggestion?

perhaps hamburg pear thinks that '\0' consists of two charactes '\' and
'0', and so it is "double character"?

well, neither is '\0' is "double character", nor "double x[*]" is.

'\0' is single zero byte.

 

[Karl Heinz Buchegger]

Dear John,

Yes, you are right, originally, I want to compare the array element so
that I will terminate the loop if array element = '\0'. I just tested it
and found that the loop terminate even it is 0. Any suggestion?

Thanks
Perry

Your descriptions get more and more confusing.
If you want help, there is one sure way for posting
such that everybody will understand what you are heading at
and what gives you problems:

p o s t c o d e


Oh, and btw: please don't top post. Put your reply beneath the text you are
replying to
and delete what you don't need in your reply. Thank you.

 

[Greg Comeau]

Hamburgpear wrote:
or I can simply write

double x[100]={'\0'} in my class_name.h file?

That's not legal syntax.

I don't know why they person would want to use '\0' "as" 0.0
for a double but actually, it's fine. It will explicity initialize
x[0] and implicitly intiialize the remaining 99 elements to 0.0

 

[Jim Langston]

Dear John,

Yes, you are right, originally, I want to compare the array element so
that I will terminate the loop if array element = '\0'. I just tested it
and found that the loop terminate even it is 0. Any suggestion?

'\0' IS 0.

'\0' is a way to represent the character zero (ASCII value 0).
another way to represent it is with 0
That is, the following two lines of code do the exact same thing:
char MyChar = '\0';
char MyChar = 0;

a character in C++ is an integer value.