int i = Convert.ToInt32(this.textBox1.Text);
int j = Convert.ToInt32(this.textBox2.Text);
int jia = i + j;
int jian= i - j;
int cheng= i * j;
int chu= i / j;
this.label1.Text = "这两个数的和为:" + jia;
this.label2.Text = "这两个数的查为:" + jian;
this.label3.Text = "这两个数的积为:" + cheng;
this.label4.Text = "这两个数相除为:" + chu;
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