I have been writing a fixed point library the would handle fixed point numbers with an 8:24 whole/fraction ratio. This has been working quite well but since I have a 24 bit fractional part, it should be able to store 2^(-24).
Code:
long long fraction_part = 0;
long long divisor = 1;
The issue here is that since the smallest possible fraction is 2^(-24) the divisor could end up needing more than 64 bits and so won't work. I'm not quite sure how else I could do this.
I am reading about positive and negative infinity in c++ and i am trying to implement them in a fixed point math arthimethic implementation
I can see that max of a int will be equal to std::numeric_limits<int>::max(); and min value of the int will be equal to std::numeric_limits<int>::min(); in c++
Here as i am defining the int max and int min manually in my fixed point math implementation, my doubt is int min = -int max; or int min = -int max -1; ?
What is the result type? Obviously, it's up to me to decide this. As reference, consider the type promotion rules for native types:
Code: short a; int b; int result = a + b; In this case, the short value is promoted to the int value, and the addition happens on int.
It would seem a similar rule (go to the wider type) would be appropriate for fixed point. But there is another dimension to the problem, which is the number of fraction bits. Should you go to the wider type? Or the most precise type? Should you endeavor to minimize the number of bits which are discarded? What's the most intuitive rule?
The input consists of one or more packets followed by a line containing only # that signals the end of the input. Each packet is on a line by itself, does not begin or end with a space, and contains from 1 to 255 characters.
I have one code that use MPI broadcast and I want to change it into Asynchronous Point to Point communication. I am newbie in Parallel programming. Looking for implementation of one simple same program in broadcast and P2P ?
the program has to accept a keypress. It should wait for some fixed amount of time. If a key is pressed within this time, the program should call a function. If a key is not pressed in this time limit the program should continue its normal execution. The problem with getch() is that it essentially requires you to press a key and it does not allow other instructions to execute until the key is pressed.
While testing some simple examples with glDrawArrays I noticed switching it to shaders can cut my frame rate by over half (from 600- 300). I know I am using a bunch of deprecated code in GLSL right now but I don't expect it to cause that much of an fps drop. I would say it was just my intel graphics chip but if the FFP can handle it I see no reason shaders can't.
//Sending 10,000 quads with GLfloats (So Vertices vector has 80,000 elements, currently no indexing). //Vertices allocated earlier in code, before main game loop
The highest Opengl version I can run is 2.1 so 120 in shaders. I know this is a fairly pointless test right now but it is still surprising to see, anything obvious I am missing?
I am working on a computer program where I need to generate points on a circle. I am familiar with this kind of algorithm:
for(d=0; d<=2*pi; d+=0.01) { x = cos(d)*radius; y = sin(d)*radius; }
However, due to the specifics of the program I am writing, I need to iterate through a fixed number of points one at a time, like so:
for ( int x = 0; x < blockSize; x++ ) { y = ??? }
This essentially "fixes" one axis of the circle, since I can't do: x=rx+sin(d)*r.
I have tried simply: "y = sin(d)*radius;" and I get a curved shape, but it's not a circle.
My question then is, how do I get the value of y in this situation, where the x axis is incrementing by 1 through a range of values? Is it mathematically possible?
I'm working on a Dijkstra's algorithm with a fixed graph. My question is, how should I go about assign distance values to the graph. The user can start from any node.
all i want to do is to read a fixed char array sized 4 from user and pass it to Binary File then Print Encrypted content from the the File to the console screen .. but it seems it prints the same input every time .. and i tried everything .. it works fine with integers and strings .. but when it come to char array nothing ..
#include <iostream> #include <fstream> #include <cstring> using namespace std;
I don't know why this doesn't work. It doesn't return any errors, but it does the polynomial equation wrong. I tried using "^" instead of "pow" and it still does it wrong. I'm getting results like "-897123897" instead of "3". This is the code:
Code: #include <stdio.h> #include <conio.h> #include <math.h> int main() [code]....
If i do run the above program in turbo C/C++ complier, it outputs "h". But,if i change the code as i=0.6 and if (i<0.6), it outputs "w". Even if i change it to i=0.8 and if(i<0.8), then also it outputs "w".
In the above program, I am calculating the square of float number. But sometimes the number is entered as NAN and sometimes Output is NAN. What is NAN? I am entering floating point number, then y NAN is entered?
I'm wondering about the point of pointers to functions. When is it used?I saw the below example. It doesn't make sense to me. I mean we can easily write code that does the same without having to use pointers.
Code:
#include <stdio.h> int addInt(int a, int b); // Adds 2 integers int add5to4(int (*function_pointer)(int, int)); int main(void) { int sum; int (*function_pointer)(int, int); }
now that I can pick a mesh I want to put it in the ground.So I'm looking for the 3d position of my mouse in the ground.this is my code about picking:
D3DXMATRIX p_matProjection, p_matView, p_matWorld, p_matInverse; pDevice->GetTransform(D3DTS_PROJECTION,&p_matProjection); pDevice->GetTransform(D3DTS_VIEW, &p_matView); pDevice->GetTransform(D3DTS_WORLD, &p_matWorld); // use the mouse coordinates to get the mouse angle
Program which accepts two lines and and determines their intersection point and whether they lie within a circle, also given interactively. I'm racing against time and I've racked my skull to no avail
I dont see any point of NULL in cstring. The code given below just outputs same as it would have done with NULL. My understanding is if size of char array is less than length of char array then null must be manually added?
#include <iostream> using namespace std; int main(){ char chr[0]; cin>>chr;//or if you use cin.getline; cout<<chr<<endl; return 0; }
Enter something: hellowwwww hellowwwww Segmentation fault (core dumped)
I'm developing a short c++ program to scan all devices connected to the system through the USB connections.
I have used libusb to scan them and it really works but this library does not provide me with the mounting point, so I get a list of devices including manufacturer, serial number, etc but not the mounting point.
I have also used libudev library but it seems to happen something similar...
I need to get the mounting point for all USB devices connected to the board, you know: /dev/ttyUSB0 ....
So, I have created a class called "point" and i have 4 "point" objects. They only have 2 variables, x and y (their position). The first 3 points form a triangle and now I need to tell if the forth one is inside or outside. I have found some solutions but they involve heavy math (they are based on the sum of the angles or something like that). I want to know if there is any way to solve this only by using the distance between points. I have created a function which takes 2 "point" objects and returns a float value which is their distance.
Here is some code:
#include <iostream> #include <cstdlib> #include <math.h> using namespace std;
