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I'm running a program and redirecting cout to an outfile, like so:
./program < infile.in > outfile.o
I want to be able to read in an option '-h' or '--help' from the command line and output a help message to the terminal. Is there a way I can do...
Started by zebraman on
, 7 posts
by 7 people.
Answer Snippets (Read the full thread at stackoverflow):
Given ./program....
Using shell redirection > only redirects stdout (cout to dup stdout to file and terminal
~$ cmd 2>log_file to print stdout onto terminal and stderr redirection to outfile.o.
You should use cerr instead of cout.
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I want to do:
int a = 255; cout << a;
and have it show FF in the output, how would i do this?
Started by acidzombie24 on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
cout << hex << a;
There are many other options to print in hexadecimal use the hex manipulator....
Printf("%.2X", a);
'2' definesUse:
#include <iomanip> ...
Prefer using it over std::cout (even with no previous C background).
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The following code:
myQueue.enqueue('a'); myQueue.enqueue('b'); cout << myQueue.dequeue() << myQueue.dequeue();
prints "ba" to the console
while:
myQueue.enqueue('a'); myQueue.enqueue('b'); cout << myQueue.dequeue(); cout << myQueue...
Started by segfault on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
cout, myQueue.dequeue() ), myQueue.dequeue() ); 1 2
The order of evaluation of cout::ostream& tmp3 = cout << tmp1; tmp3 << tmp2;
or
auto tmp1 = myQueue.dequeue(); auto tmp2 = myQueue.dequeue(); std::ostream& ....
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I want to print out a function pointer using cout, and found it did not work. But it worked after I converting the function pointer to (void *), so does printf with %p, such as
#include <iostream> using namespace std; int foo() {return 0;} int main...
Started by ibread on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at stackoverflow):
Regarding your edit; (int)*first << ' '; } std:....
; ++first) { std::cout << std::hex << std::setw(2) << std::setfill('0') << to cout is the right thing (TM) to do in C++ if you want to see their values.
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I know that cout have buffer several days ago, and when I google it, it is said that the buffer is some like a stack and get the output of cout and printf from right to left, then put them out(to the console or file)from top to bottem. Like this,
a = ...
Started by lucas on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at stackoverflow):
When you have a cout statement followed by multiple insertions << you are actually invoking multiple function calls, one ....
To date:
Implementation details of cout Chained calls Calling with buffering.
You are mixing a lot of things.
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Hi,
how do I bind a std::ostream to either std::cout or to an std::ofstream object, depending on a certain program condition? Although this invalid for many reasons, I would like to achieve something that is semantically equivalent to the following:
std...
Started by Matthias Vallentin on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
If you....
After that you can write to "out" and it will end up in the right destination .
Ostream* fp = &cout; std::ofstream fout; if (argc > 1) { fout.open(argv[1]); fp = &fout; } process of either cout or the output file stream to out.
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Hi, I'm pretty sure this is a simple question in regards to formatting but here's what I want to accomplish:
I want to output data onto the screen using cout. I want to output this in the form of a table format. What I mean by this is the columns and ...
Started by BobS on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
Use something like this:
cout << format("%|1$30| %2%") % var1(21) << left << "Test2" << 2 << endl; cout << setw(21) << left << "Iamlongverylongblah....
I advise using Boost Format.
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I know cout and printf have buffer today, and it is said that the buffer is some like a stack and get the output of cout and printf from right to left, then put them out(to the console or file)from top to bottem. Like this,
a = 1; b = 2; c = 3; cout<...
Started by lucas on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
The cout version is equivalent to:
(((cout << a) << b) << c)
Effectively, it's actually; ( cout, a ), b ), c )
Since for the outer call it's not (AFAIK) defined which order the two parameters.
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Hello,
For C++/linux programs, how does writing to cout (when cout has been redirected to a file during program launch) compare against writing to the target file directly? (via say fstream)
Does the system do the appropriate magic at the start of the...
Started by MK on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
I prefer using simple cout calls for quick and dirty logging and "printf" style, level 2 writes to stderr, level....
It allows for simple text output (via printf/fprintf/cout).
When you simply redirect cout/stdout from the shell.
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Hi I'm new to C++ programming and I try to make my first exercise on a mac using gcc in the terminal.
Unfortunately, I can't compile because of issues related to iostream. With a simple program as :
#include "<"iostream">"
int main() {
std::cout...
Started by Patof on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
Endl; falls under the std namespace
your 2 options() { cout << "hello world....
Lt;iostream> using namespace std; int main() { cout << "hello world"; cout << endl the steps necessary to link C++ correctly.
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