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My project is compiling and opening up on the web but the main loop is not working. The error seems to be that usleep is undefined. I'm not sure how I can correct this. As per the error message, I seem to be dividing by zero (undefined). I tried removing 'fps' but no luck.
#define emscripten_set_main_loop(func,fps,simulateInfiniteLoop)
while (1) { func(); usleep(1000000/fps); }
Expands to:
while (1) { loop(); usleep(1000000/0); }
identifier "usleep" is undefined C/C++(20)
Problem solved! I switched over to using emscripten_set_main_loop_arg, put all my variables in a struct, and rewrote my functions to accept pointers to the struct and deal appropriately.
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if(cout<<"h"){}
this gives me an output
h
Any idea why, I have tried many variations of it and it still works.
That's because the if statement needs to evaluate the condition you give into it, plus, streams are implicitly convertible to bool.
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In turbo c 3.2 I am getting
Divide error
and in code blocks IDE I getting error that
initgraph() and closegraph() are refrence at compile time. (I added graphics header and library file in folder of codeblocks).Please give me solution?
the code i written is
#include<graphics.h>
int main()
{
int a=10,ab;
initgraph(&a,&ab,"C:\\TURBOC3\\BGI");
circle(100,200,20);
closegraph();
return 0;
}
In addition to the backslash issue in the path, it's extremely unlikely that you are using a 3270 compatible display. Why don't you pass in the address of a with a=0. ab must be set to a requested mode unless you set the driver to autodetect, which will then select the highest available mode. See here.
The path string should be "C:\\TURBOC3\\BGI" (note the double backslashes instead of single backslashes)
I hope this solves the problem. I can't see any other error in code.
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I've tried searching for the answer, but nothing mentions stringstream specifically. I would guess that it would always work and you can always go back as far as the beginning of the underlying string.
Am I right?
How likely is istream::ungetc() to work with a stringbuf (as used in stringstream)?
Well, never.
There's no such thing like istream::ungetc() defined from the standard.
You can use either
int std::ungetc( int ch, std::FILE *stream )
or
std::basic_istream& std::basic_istream::unget()
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I'm new to C++ and currently I'm using Code::Blocks to run my code. So, I wonder if i can set up timer until a code is executed because i need timer to make my program looks better. Any answers is accepted ^^
I wrote a timer class long ago. You can find the complete code on Github here: timer
It is a complete example with Makefile as well.
Note: You will need the ability to compile C++11.
You can create a class for this purpose. In constructor and destructor get the current time. You only need to subtracts them to get the elapse time of each functions including main.
http://en.cppreference.com/w/cpp/chrono
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Is it better, from complexity eye of view, to call a function and return its value to another function
a = foo();
bar (a);
Or to make a nested call?
bar(foo());
Indeed, I am making this millions of times.
If it depends on something else, please mention it.
You should go for clarity - the compiler should optimize the temporary away. But if it's critical, benchmark and look at the assembly code.