multiple versions of stdlib.h [closed] - c++

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I was trying to compile a program and stdlib.h didn't seem to exsist. When I tried to search for it I seem to be able to find 4 versions of stdlib.h. I was wondering how one can correct this issue:
:6:20: fatal error: stdlid.h: No such file or directory
#include <stdlid.h>
^
compilation terminated.
sudo find / -name 'stdlib.h'
/usr/lib/syslinux/com32/include/stdlib.h
/usr/include/stdlib.h
/usr/include/x86_64-linux-gnu/bits/stdlib.h
/usr/include/c++/4.8/tr1/stdlib.h

stdlid.h is wrong, you need a b instead of a d

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What does ch!=?.? mean in c++ [closed]

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Closed 1 year ago.
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This is used here do {....} while(ch!=?.?); what does ch!=?.? mean here can anybody please help with it.
It's a syntax error with both clang and gcc.
#JonathanLeffler is usually right and I think he nailed the root cause. I used to see this when text was being copied from Microsoft Word to the web (lack of transcode from a Windows code page to ascii/utf8?).

Problem in include path and oistream error [closed]

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Closed 2 years ago.
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Please help me when I write any code in c++ then following error is detected
1.#include errors detected. Please update your includePath. Squiggles are disabled for this translation unit (F:\Run\Ram).
2.cannot open source file "oistream"
VS Code version: Code 1.48.1 (3dd9051, 2020-08-19T17:12:39.269Z)
OS version: Windows_NT ia32 6.1.7601
Welcome to c++ :)). The problem is that the library is called "iostream" and NOT "oistream". It might help to think of it as "input/output stream".

What is the use function in c++? [closed]

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Closed 3 years ago.
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I'm currently reading a c++ book and one of the function is
void fp(char v[]){
for(char* p = v; *p!=0;p++) use(*p);
}
I wrote this into my editor and compiled it. I also included the headers
#include <iostream>
#include <string.h>
But my terminal returns the following message:
use of undeclared identifier 'use'
I also google it and its nowhere to be found online, the function doesn't exist.
That's because there is no such standard library function.
The author is either using pseudo-code here, or has defined this function somewhere else in the book.

C++ error: decomposition declaration not permitted in this context [closed]

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Closed 4 years ago.
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Why is g++ giving an error like this?
blahblah.h:80:10: error: decomposition declaration not permitted in this context
float[NUM_OUTPUTS] output_buffer;
(Already solved, but creating this because there's no good google hits for this error text, and the error message is inscrutable.)
In C++ declarations, the array size goes after the variable name, not after the type:
float output_buffer[NUM_OUTPUTS];

do_trucate in jinja2, correct usage needed [closed]

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I think I saw something on using this to truncate test as a filter, but I've seen to no idea how to use it. Using as xx|do_trucate(20) gives the following:
TemplateAssertionError: no filter named 'do_truncate'
What is the correct usage?
Doh, from the spec I saw
do_trucate
http://code.nabla.net/doc/jinja2/api/jinja2/jinja2.filters.html
But in reality, its just truncate