if (expression) {
    // Code
}

if (expression)
{
    // Code
}

switch (expression)
{
    case 1:
        // Code, try to keep it small (call a function, or call max 3 instructions)
        break;
    case 2:
        // Code, try to keep it small (call a function, or call max 3 instructions)
        break;
    default:
        break;
}

class ClassName
{
    public:
        // Code
    protected:
        // Code
    private:
        // Code
};

class ClassName
{
    private:
        void mFunctionName();

        int mVariableName;

        // Code
};

void FunctionName(parameters);

void FunctionName(parameters)
{
    // Code
}

int variableName;

int gVariableName;

#define CONSTANT_VARIABLE_NAME value

constexpr int CONSTANT_VARIABLE_NAME = value;

template<typename Type_T>
void FunctionName(Type_T name);

void FunctionName(int parameterName);

#include "TIMGE/TIMGE.hpp" // Your own libraries first

#include <iostream> // C++ libraries second

#include <glfw/glfw3.h> // Other libraries third