I'm trying to make a simple calculator, just to understand how it works, and I came across the following problem:
If I put 5 + 5 on the calculator it gives me the value of 55 as an answer. To fix this I tried to pass the values entered to int , but it always gives the error:
Can not implicitly convert type 'int' to 'string'
private void BtnSoma_Click(object sender, EventArgs e)
{
lblResultado.Text = Convert.ToInt32(txtNum1.Text) + Convert.ToInt32(txtNum2.Text);
}
You need to convert to integer to make the account and then convert back to string . Nothing guarantees that something will be typed correctly, and if the entered data is not an integer the application will break, to correct this another code needs to be made:
private void BtnSoma_Click(object sender, EventArgs e) {
if (!int.TryParse(txtNum1.Text, out var valor1) || !int.TryParse(txtNum2.Text, out var valor2)) {
MessageBox.Show("Pelo menos um dos valores é inválido", "Entrada inválida", MessageBoxButtons.YesNo);
return;
}
lblResultado.Text = (valor1 + valor2).ToString();
}
See running on .NET Fiddle . And no Coding Ground . Also I placed GitHub for future reference . Slightly different to be easily testable online.