error unresolved unternal symbol

[Fakherthe1]

#include <iostream>
using namespace std;
class gra
{
private:
int g;
int g2;
public:
gra();
gra(int a,int b);
gra add(const gra& rhs);
};
gra::gra(int a,int b)
{
g=a;
g2=b;
}
gra gra::add(const gra& rhs)
{
gra sum;
sum.g=g+rhs.g;
sum.g2=g2+rhs.g2;
return sum;
}

int main()
{
gra p1(34,12);
gra p2(13,65);
gra ad;
ad=p1.add(p2);
}


This is my program when i build it gives this error
unresolved external symbol "public: __thiscall gra::gra(void)" (??0gra@@QAE@XZ) referenced in function "public: class gra __thiscall gra::add(class gra const &)" (?add@gra@@QAE?AV1@ABV1@@Z)

[Peter87]

You have not defined the default constructor.

[tntxtnt]

Your class doesn't have the default constructor's implementation. When you declare gra sum; the compiler will init sum with the default constructor which you don't implement it yet.

gra::gra()
{
    g=0;
    g2=0;
}

[Fakherthe1]

Having Problem with dxva

dxva checker report

ATI Radeon HD 2400
ModeMPEG2_C: DXVA1, 720x480 / 1280x720 / 1920x1080 / 3840x2160
ModeMPEG2_D: DXVA1, 720x480 / 1280x720 / 1920x1080 / 3840x2160
ModeMPEG2_IDCT: DXVA2, 720x480 / 1280x720 / 1920x1080 / 3840x2160
BB0796AE-2ED4-468D-A182-38F2CEADECF8: DXVA1, 720x480 / 1280x720 / 1920x1080 / 3840x2160
5B23D46D-FA5F-4FDC-B78A-7EB2787942EC: DXVA1, (Skipped)
ModeWMV8_PostProc: DXVA1/2, 720x480 / 1280x720
ModeWMV9_PostProc: DXVA1/2, 720x480 / 1280x720