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void CMyDlg::OnButtonOperation() //按钮Operation的函数{    // TODO: Add your control notification handler code hereint numA, numB, numC;char chA[10], chB[10], chC[10];m_editA.GetWindowText(chA, 10); //m_editA、m_editB、m_editC为控件型变量m_editB.GetWindowText(chB, 10);numA = atoi(chA);numB = atoi(chB);numC = numA + numB;itoa(numC, chC, 10);m_editC.SetWindowText(chC);}

UpdateData(TRUE);m_numC = m_numA + m_numB;UpdateData(FALSE);

并且用类向导编辑了float数值型编辑框变量范围0~100.所以当超出范围时会有提示

如上，第三个框超出范围。

同时，不能删除初始化的数字0，不然：

（不过第三个编辑框用于输出结果，删0也没事儿）

方法三：利用GetDlgItem()和GetWindowText()和SetDlgItem()

int numA, numB, numC;	char chA[10], chB[10], chC[10];	GetDlgItem(IDC_EDIT_A)->GetWindowText(chA, 10); //10为长度	GetDlgItem(IDC_EDIT_B)->GetWindowText(chB, 10); //10为长度	numA = atoi(chA);	numB = atoi(chB);	numC = numA + numB;	itoa(numC, chC, 10);//10为十进制	GetDlgItem(IDC_EDIT_C)->SetWindowText(chC);

int numA, numB, numC;	char chA[10], chB[10], chC[10];	GetDlgItemText(IDC_EDIT_A, chA, 10);	GetDlgItemText(IDC_EDIT_B, chB, 10);	numA = atoi(chA);	numB = atoi(chB);	numC = numA + numB;	itoa(numC, chC, 10);//10为十进制	SetDlgItemText(IDC_EDIT_C, chC);

int numA, numB, numC;	numA = GetDlgItemInt(IDC_EDIT_A);	numB = GetDlgItemInt(IDC_EDIT_B);	numC = numA + numB;	SetDlgItemInt(IDC_EDIT_C, numC);

int numA, numB, numC;	char chA[10], chB[10], chC[10];	::SendMessage(GetDlgItem(IDC_EDIT_A)->m_hWnd, WM_GETTEXT, 10, (LPARAM)chA);	::SendMessage(GetDlgItem(IDC_EDIT_B)->m_hWnd, WM_GETTEXT, 10, (LPARAM)chB);	numA = atoi(chA);	numB = atoi(chB);	numC = numA + numB;	itoa(numC, chC, 10);//10为十进制	::SendMessage(GetDlgItem(IDC_EDIT_C)->m_hWnd, WM_SETTEXT, 10, (LPARAM)chC);