Quick Questions, please help!

Bobby White

The follow error occurs with the following code: "Only assignment, call, increment, decrement, and new object expressions can be used as a statement"

{
                    ((double.TryParse(textBox1.Text, out a)) && (double.TryParse(textBox3.Text, out c)));

                       b = Math.Sqrt((c * c) - (a * a));

                       textBox2.Text = b.ToString();
                    }

7 Replies

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Santhosh N16y ago
Its a basic if else contruct misinterpretion..
if (condition)
{
}
else if (condition2)
{
}
else
{
}
double a;
                    double b;
                    double c;

                    if ((double.TryParse(textBox1.Text, out a)) && (double.TryParse(textBox2.Text, out b)))
                    {
                        c = Math.Sqrt((a * a) + (b * b));

                        textBox3.Text = c.ToString();
                    }
                    else if ((double.TryParse(textBox1.Text, out a)) && (double.TryParse(textBox3.Text, out c)));

                    {
                    ~~((double.TryParse(textBox1.Text, out a)) && (double.TryParse(textBox3.Text, out c)));~~

                       b = Math.Sqrt((c * c) - (a * a));

                       textBox2.Text = b.ToString();
                    }
Mahesh Chand16y ago
It looks like you are missing if statement

{
            {
                {
                    double a;
                    double b;
                    double c;

                    if ((double.TryParse(textBox1.Text, out a)) && (double.TryParse(textBox2.Text, out b)))
                    {
                        c = Math.Sqrt((a * a) + (b * b));

                        textBox3.Text = c.ToString();
                    }
                    else
                    {
                    if ((double.TryParse(textBox1.Text, out a)) && (double.TryParse(textBox3.Text, out c)));

                       b = Math.Sqrt((c * c) - (a * a));

                       textBox2.Text = b.ToString();
                    }
                }
            }
        }
    }
}
Bobby White16y ago
Can somebody please fix my code, I'm new to this, and I don't know what to do to fix it..

Thanks in advance.
Bobby White16y ago
Can you maybe fix up my code? and tell me what the fix does, im new to this.
Bobby White16y ago
Heres the entire thing:

{
            {
                {
                    double a;
                    double b;
                    double c;

                    if ((double.TryParse(textBox1.Text, out a)) && (double.TryParse(textBox2.Text, out b)))
                    {
                        c = Math.Sqrt((a * a) + (b * b));

                        textBox3.Text = c.ToString();
                    }
                    else
                    {
                    ((double.TryParse(textBox1.Text, out a)) && (double.TryParse(textBox3.Text, out c)));

                       b = Math.Sqrt((c * c) - (a * a));

                       textBox2.Text = b.ToString();
                    }
                }
            }
        }
    }
}
Bobby White16y ago
Well theres more to it than that lol... I just put the part of the problem
Mahesh Chand16y ago
This statement is incorrect. You can't just write it like this. It has to be assigned to some variable.

((double.TryParse(textBox1.Text, out a)) && (double.TryParse(textBox3.Text, out c)));

Something like this:
bool t = ((double.TryParse(textBox1.Text, out a)) && (double.TryParse(textBox3.Text, out c)));