C语言如何实现一个正在循环运行的程序，当按下某个键时，运行另一个函数？？

Private stopIt As Boolean Private Sub Command1_Click() Dim shuzhi As Double Dim shuzhi1 As Double Text1.Text = "正在运行" For shuzhi = 1 To 60000 If stopIt Then Exit Sub DoEvents For shuzhi1 = 1 To 20000 Next shuzhi1 Next shuzhi Text1.T