How to solve error operator '-' cannot be applied to operands of type 'float' and 'string'

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2.40/5 (5 votes)

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How to solve Error Operator '-' cannot be applied to operands of type 'float' and 'string'

What I have tried:

C#

private void textBox4_TextChanged(object sender, EventArgs e)
{
    try
    {
        textBox5.Text=(float.Parse(textBox3.Text) - float.Parse(textBox4.Text).ToString());
    }
    catch
    {

    }
}

Posted 5-Feb-17 3:47am

Methoun Ahmed

Updated 5-Feb-17 10:15am

PIEBALDconsult

v2

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2 solutions

Solution 2

Replace

C#

textBox5.Text=(float.Parse(textBox3.Text) - float.Parse(textBox4.Text).ToString());

with

C#

textBox5.Text=(float.Parse(textBox3.Text) - float.Parse(textBox4.Text)).ToString();

As usual with computer programs everyt
thing matters, missing space, position of () ...

Advice: use programmer editor like NotePad++, they show you how () are matching among other things.

Posted 5-Feb-17 10:15am

Patrice T

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Jochen Arndt · Accepted Answer · 2017-02-05T03:52:00

Solution 1

Check the parentheses.
Your code:

C#

textBox5.Text=(float.Parse(textBox3.Text) - float.Parse(textBox4.Text).ToString());

Correct:

C#

textBox5.Text=(float.Parse(textBox3.Text) - float.Parse(textBox4.Text)).ToString();

Posted 5-Feb-17 3:52am

Jochen Arndt