C / C++ / MFC

AdvancedCPP wrote:

What is the use of abstract class ?

class Shape
{
public:
    Shape( int nWidth, int nHeight )
    {
        m_nWidth  = nWidth;
        m_nHeight = nHeight;
    }

    virtual double getArea() = 0; // can't derive from directly

protected:
    int m_nWidth;
    int m_nHeight;
};

//====================================================================

class Circle : public Shape
{
public:
    Circle( int nWidth, int nHeight ) : Shape(nWidth, nHeight) {};

    double getArea() 
    {
        int nRadius = m_nWidth / 2;
        return 3.1415962 * nRadius * nRadius;
    }
};

//====================================================================

class Square : public Shape 
{
public:
    Square( int nWidth, int nHeight ) : Shape(nWidth, nHeight) {};

    double getArea() { return m_nWidth * m_nHeight; }
};

AdvancedCPP wrote:

I have not really used in my c++ code practically

<CustomBuildRule
			Name="GraphViz Dot to PNG and SVG"
			DisplayName="GraphVizPNGSVGRule"
			CommandLine="images "$(InputDir)\$(InputName).gv""
			Outputs="$(InputDir)\images\$(InputName).png;$(InputDir)\images\$(InputName).svg;"
			FileExtensions="*.gv"
			ExecutionDescription="builds png and svgfile"
			>
			<Properties>
			</Properties>
		</CustomBuildRule>

echo off
set "p=%~dps1" 
set "px=Images\"
set "newp=%p%%px%"
set "newsvg=%newp%%~n1%.svg"
set "newpng=%newp%%~n1%.png"
set "source=%~s1"
echo Creating svg...
dot.exe -T svg %source% -o %newsvg%
echo Creating png...
dot.exe -T png %source% -o %newpng%

Manoj7390 wrote:

I cannot use shifting operator because it will give numbers other than 1/0. <layer>

Manoj7390 wrote:

If I shift it once i will get 2.

int Answer = (u << 2) | (p << 1) | q

q = Answer & 1;
p = (Answer >> 1) & 1;
u = (Answer >> 2) & 1;

fscanf_s(f_ptr_seed_inf,"%lf     %lf     %s\n",&sd_dis[ifl],&time_onset[ifl], ftitle[ifl].GetBuffer(MAX_PATH), MAX_PATH);

Unlike scanf and wscanf, scanf_s and wscanf_s require the buffer size to be specified for all input parameters of type c, C, s, S, or string control sets that are enclosed in []. The buffer size in characters is passed as an additional parameter immediately following the pointer to the buffer or variable. For example, if you are reading a string, the buffer size for that string is passed as follows:

char s[10];

scanf_s("%9s", s, _countof(s)); // buffer size is 10, width specification is 9