C#计算器,等号老不对?帮忙写个等号的代码.private void button28_Click(object sender,EventArgs e)//等号{Single r;string t = textBox1.Text;int space = t.IndexOf(' ');\x05\x05\x05//搜索空格位置string s1 = t.Substring(0,space);\x05\
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