为什么我的 float 变量没有从文本框中获取正确的值？

Question

I need to calculate the percent but when I put a float value in the textbox the variable convert the value to an int value.

 float intereses = 0, monto = 0, total = 0;

 intereses = float.Parse(textBox1.Text);
 monto = float.Parse(txtMonto.Text);

 total = ((monto * intereses)/100);

 MessageBox.Show("El "+textBox1.Text+" % de "+monto+" es "+ total);

Answer 1

First, that's not necessary initialize variables in the first line.

If i'm not wrong, For the problem, maybe your UI framework(DevExpress) or windows form component cannot recognize "." character in the textbox when you're trying to convert(.Parse) or validate it to float type .

total = ((5000* 05)/100); Debug: 250

And why you didn't try to put intereses in MessageBox.Show("El "+textBox1.Text+" % de "+monto+" es "+ total); instead of textBox1.Text to see what's the exact problem?

Answer 2

Use the built in NumericUpDown control and set the number of decimal places in it as shown below. This control is designed to handle numeric values with or without decimal point, it will handle the decimal point for you so that you don't have to worry about it