cmath Questions
6
Solved
I'm trying to allow my program to round a number up and down respectively.
For example, if the number is 3.6, my program is suppose to round up the nearest number which is 4 and if the number is ...
2
Solved
I want to compute a lookup table at compile time for a mathematical function in a given range and then retrieve values from the table at run time. My code is as follows:
#include <iostream>
...
3
I'm compiling my project with clang but I'm having an odd error:
[ 1%] Building CXX object CMakeFiles/tfs.dir/src/actions.cpp.o
In file included from /home/travis/build/dominique120/miniature-adve...
4
Solved
In my unmanaged C++ source i have:
#define _USE_MATH_DEFINES
#include <cmath>
and then I use M_PI a couple of times.
Compiling in Debug configuration works flawlessly but in Release it giv...
Pert asked 2/11, 2010 at 12:8
2
Solved
I'd like to understand the behavior of the following code, from the C++ Standard point of view (GCC 9.3, C++20):
#include <cstdlib>
template<class> struct type_tester;
int main()...
Peacetime asked 21/2, 2022 at 11:32
5
Solved
I'm running a simple C++ program from HackerRank about pointers and it works fine on the website. However,
when I run it on MacOS, I get error: call to 'abs' is ambiguous and I'm not sure exactly w...
1
I have a simple C++ program that imports cmath.
#include <cmath>
int main() {
return 0;
}
I'm trying to compile it using the following command.
clang++ -o test main.cpp -std=c++14
But...
Rotorua asked 15/4, 2020 at 19:12
7
Solved
Are there any definitions of functions like sqrt(), sin(), cos(), tan(), log(), exp() (these from math.h/cmath) available ?
I just wanted to know how do they work.
Dutybound asked 27/12, 2010 at 19:10
1
Solved
I got variable named y0 and included cmath, when compiling it with g++ without any args, I get a compilation error
error: invalid operands of types ‘double(double) throw ()’ and ‘double’ to binary...
4
I have the following C++ code:
#include <math.h>
#include <cmath.h> // per http://www.cplusplus.com/reference/clibrary/cmath/abs/
// snip ...
if ( (loan_balance < 0) && (a...
2
Solved
I've recently run into an issue where I got a segfault in MSVC where I wouldn't in GCC.
After hours I realized that apparently my version of MSVC does not support the following syntax:
double va...
Zolner asked 20/5, 2019 at 14:33
2
Solved
The page https://en.cppreference.com/w/cpp/numeric/math/fabs mentions that std::fabsf is available since C++11. However, when I use G++ 6.3.0 to compile even the simplest program that uses std::fab...
3
Solved
I have a custom data type that in practice can be either float or double. On every OS except OSX, I am able to successfully build this C++11 template:
#include <cmath>
#include <cstdlib&g...
4
Solved
Test code:
#include <cmath>
#include <cstdio>
const int N = 4096;
const float PI = 3.1415926535897932384626;
float cosine[N][N];
float sine[N][N];
int main() {
printf("a\n");
for ...
Tormentor asked 7/8, 2011 at 23:17
7
Solved
Many algorithms require to compute (-1)^n (both integer), usually as a factor in a series. That is, a factor that is -1 for odd n and 1 for even n. In a C++ environment, one often sees:
#include&l...
3
Solved
So noticed from this page that none of the math functions in c++11 seems to make use of constexpr, whereas I believe all of them could be. So that leaves me with two questions, one is why did they ...
2
Solved
Here is some code:
#include <iostream>
#include <cmath>
using namespace std;
int main()
{
long long int a, b;
long long int c;
cin >> a >> b;
c = abs(a) + abs(b);
...
4
Solved
I assume that abs and fabs are behaving different when using math.h. But when I use just cmath and std::abs, do I have to use std::fabs or fabs? Or isn't this defined?
1
Solved
I was surprised by the number of C++ facilities to represent quiet NaN value. I found three standard ways:
std::numeric_limits<T>::quiet_NaN() - generic, and I thought it was the chosen one...
Anthracite asked 4/2, 2017 at 20:55
2
Solved
I've been working on a few project Euler exercises to improve my knowledge of C++.
I've written the following function:
int a = 0,b = 0,c = 0;
for (a = 1; a <= SUMTOTAL; a++)
{
for (b = a+1;...
Caddoan asked 10/12, 2016 at 6:19
3
Solved
I have here a small test app which uses isnan from <math.h>:
#include <iostream>
#include <math.h>
int main()
{
double d = NAN;
std::cout << isnan(d) << '\n';
re...
4
Solved
I used to work with math.h without any problem. Now, I use an external library which itself has a file called math.h, but which includes < cmath>.
Adding this library to my project (or even j...
Dagda asked 21/10, 2010 at 0:51
3
Solved
I am sure this is a really stupid question, but when I pass an angle of 180 degrees into c/c++'s cos() and sin() functions I appear to receive an incorrect value. I know that it should be:
sin of 0...
Spue asked 19/7, 2015 at 14:14
4
Solved
Since isnan can be either a macro (in C++98) or a function defined in namespace std (in C++11), an obvious (and possibly naive) way to write the code that works in both cases is illustrated by this...
Metalliferous asked 18/11, 2015 at 1:42
3
Solved
I checked the difference between abs and fabs on python here
As I understand there are some difference regarding the speed and the passed types, but my question related to native c++ on V.S.
Rega...
Triumvirate asked 16/11, 2015 at 15:7
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