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string s1,s2,s3;
int num1,num2,num3;
// num1=this->GetDlgItemInt(IDC_EDIT1);
// num2=this->GetDlgItemInt(IDC_EDIT2);
CWnd* m_wnd1=this->GetDlgItem(IDC_EDIT1);
m_wnd1->GetWindowText(s1);
CWnd* m_wnd2=this->GetDlgItem(IDC_EDIT2);
m_wnd2->GetWindowText(s2);
num1=atoi(s1);
num2=atoi(s2);
num3=num1+num2;
_itoa(num3,s3,10);
this->SetDlgItemText(IDC_EDIT3,s3);