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c++ define constant in class header

DavidPgl answered on November 27, 2021 Popularity 8/10 Helpfulness 2/10

answer c++ define constant in class header

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c++ define constant in class header

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class Foo
{
public:
    const int a = 5; // Valid use of const.
    constexpr int b = 7; // Invalid use of constexpr, won't even compile!
    static constexpr int c = 10; // Valid use of constexpr.

    int arrA[a]; // ERROR: 'a' is defined at runtime, so you can't use it to define a size.
    int arrB[b]; // ERROR: You couldn't even define 'b', so this is not going to work...
    int arrC[c]; // VALID: 'c' is known by the compiler, and is guaranteed to only ever be 10!
}

Popularity 8/10 Helpfulness 2/10 Language cpp

Source: stackoverflow.com

Tags: c++ class header

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Contributed on Nov 27 2021

DavidPgl

0 Answers Avg Quality 2/10

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c++ define constant

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-1

#include <iostream>
using namespace std;

#define PI 3.14159
#define NEWLINE '\n'

int main ()
{
  double r=5.0;               // radius
  double circle;

  circle = 2 * PI * r;
  cout << circle;
  cout << NEWLINE;

}
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Popularity 9/10 Helpfulness 1/10 Language cpp

Source: cplusplus.com

Tags: c++

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Contributed on Jun 14 2022

Kristi

0 Answers Avg Quality 2/10

c++ define constant in class header

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