String

Question

i want Develop a simple calculator who take two values and a operator in a Single textbox all work done on Enter click event How can i separate the string? For Operations.

Vulpes · Answer

If the two values and the operator are entered in that order separated by spaces (for example: 2 3 +) then you can separate the string and perform the calculation as follows: private void button1_Click(object sender EventArgs e) { string[] items = textBox1.Text.Trim().Split(new char[] { ' ' } StringSplitOptions.RemoveEmptyEntries); if (items.Length != 3) { MessageBox.Show(There must be two operands and one operator); textBox1.Focus(); return; } decimal val1 val2; // note that zero will be used if values are not valid numbers decimal.TryParse(items[0] out val1); decimal.TryParse(items[1] out val2); if (items[2].Length > 1) { MessageBox.Show(Invalid operator); textBox1.Focus(); return; } char op = items[2][0]; decimal result = 0; switch (op) { case '+': result = val1 + val2; break; case '-': result = val1 - val2; break; case 'x': case 'X': case '*': result = val1 * val2; break; case '/': if (val2 != 0) { result = val1 / val2; break; } else { MessageBox.Show(Can't divide by zero); textBox1.Focus(); return; } case '%': result = val1 % val2; break; default: MessageBox.Show(Invalid operator); textBox1.Focus(); return; } textBox1.Text = result.ToString(); // write result back to textbox }