private void btnCalculate_Click(object sender, System.EventArgs e) { decimal weightInPounds = 0m; try { weightInPounds = Convert.ToDecimal(txtPounds.Text);...

private void btnCalculate_Click(object sender, System.EventArgs e) { decimal weightInPounds = 0m; try { weightInPounds = Convert.ToDecimal(txtPounds.Text); if (weightInPounds > 0) { decimal weightInKilos = weightInPounds / 2.2m; lblKilos.Text = weightInKilos.ToString("f2"); } else MessageBox.Show("Weight must be greater than 0.", "Entry error"); txtPounds.Focus(); } catch(FormatException) { MessageBox.Show("Weight must be numeric.", "Entry error"); txtPounds.Focus(); } } (Refer to code example 7-1.) If the user enters 118 in the text box and clicks the Calculate button, what does the code do?

Expert Solution

/* when calculate button clicks it saves lblKilos.Text with value 53.64 */

/* BELOW DOWN THERE IS COMMENTS FOR EVERY STATEMENT */

private void btnCalculate_Click(object sender, System.EventArgs e)
{    decimal weightInPounds = 0m;
   try {
           weightInPounds = Convert.ToDecimal(txtPounds.Text); // returns 118m
           if (weightInPounds > 0) { // true 118m > 0
               decimal weightInKilos = weightInPounds / 2.2m; // 118m/2.2m = 53.63636363636363
               lblKilos.Text = weightInKilos.ToString("f2"); // 53.64 // round to 2 decimal places
           }else
               MessageBox.Show("Weight must be greater than 0.", "Entry error");
           txtPounds.Focus(); // it highlights textbox
       } catch(FormatException) {
           MessageBox.Show("Weight must be numeric.", "Entry error");
           txtPounds.Focus();
       }
}

venereology answered 2 years ago

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