计算器 练习

 public partial class 计算器 : Form
    {
        public 计算器()
        {
            InitializeComponent();
        }

        private void jsa_Click(object sender, EventArgs e)
        {
            int a = Convert.ToInt32(this.num1.Text.Trim());
            int b = Convert.ToInt32(this.num2.Text.Trim());
            this.sum.Text = (a + b).ToString();
        }
    }