I would prefer i++ over the other two because it expresses a common idiom. Those lines of code all end up doing exactly the same thing. But if I’m scanning code for an increment, the ++ just sort of jumps off the page. Also, the i = i++ is actually incorrect. You meant i = … Read more
This should work: OleDbCommand cmd = new OleDbCommand(@”INSERT INTO tbbill(invoice,[datetime],custm,total,tax,grand) VALUES(” + Convert.ToInt32(txtinvoice.Text) + “,\”” + dateTimePicker1.Value.ToString(“yyyy/MMM/dd”) + “\”,\”” + Convert.ToString(txtcn.Text) + “\”,\”” + txtttl.Text + “\”,\”” + Convert.ToInt32(cmtax.Text) + “\”,\”” + txtgrdttl.Text + “\”)”, con); cmd.CommandType = CommandType.Text; cmd.ExecuteNonQuery(); con.Close(); EDIT: As stated by others, your query is still open to SQL injection. Dmitry’s … Read more
The first declaration creates a list with an underlying array with a size of 5. The second declaration copies data from the passed array to the underlying array in the list. So the second declaration needs to: Create an empty array Copy the values in that array to another array Since it’s also harder to … Read more
Assuming ICANON is a bit-mask, i.e. an integer with bits set to represent some feature, that statement will make sure those bits are not set in c_lflag. This is often called “masking off” those bits. The operation is a bitwise AND with the bitwise inverse (~ is bitwise inverse). So, if the value of c_lflag … Read more
Since you have a List<object> that actually contains List<List<Player>> and you want to get a list of players in one big list. Unfortunately for some external reason you are unable to change the API to give you sensibly typed data, you need to go through a couple of hoops. So given this: List<object> players = … Read more
You can use System.Timers.Timer. private void Form1_KeyDown(object sender, KeyEventArgs e) { if(e.KeyCode == Key.A) { if(!timer1.Enabled) timer1.Start(); else timer1.Stop(); } } 10 solved How to perform an action while a key is pressed [closed]
You need to end the recursion at some point: int factorial(int b) /*Function definition*/ { if (b == 0) return 1; return b*factorial(b-1); } 2 solved why does this recursive program for factorial not work? [closed]
It’s optimization on level 3, basically a shortcut for several other options related to speed optimization etc. (see link below). I can’t find any documentation on it. … it is one of the best known options: https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html http://docs.nvidia.com/cuda/cuda-compiler-driver-nvcc/#options-for-altering-compiler-linker-behavior solved What is option -O3 for g++ and nvcc?
As panta-rei correctly pointed out, it looks like you’re trying to contain a string of the form “string” + string form of (i) but you’re actually doing pointer arithmetic which is illogical in this case (you’re just passing a pointer incremented i from some location – who knows what’s in that memory?). In order to … Read more
After the preprocessor runs, you’re left with: int main() { int girlsAge = (“14” / 2) + 7; printf(“%s can date girls who are %d or older.\n”, “Hunter Shutt”, girlsAge); return 0; } As you can see, “14” is a string, not a number. #define AGE 14 would fix it, but you’re better using variables … Read more
In your first program, you do i++ twice, and m++ once. So at the end of the first iteration, the values of i and m are equal (which is 2) – so in the next iteration i < m condition fails, and the loop exits. In the second case, you set the value of m … Read more
You want to call a method, so you would have to add the parenthesis: myclass obj = new myclass(); obj.b = true; while (obj.notEnough()) { //Methods are always called by using the parenthesis () Thread.Sleep(5); } 6 solved How to use class method to stop loop? [closed]
Well, I found the problem, XCODE create the files here: /Users/[name]/Library/Developer/Xcode/DerivedData/[projectname]/Build/Product/Debug solved Write file with C++ [closed]
The error arises from a simple typo. You have spaces added to the value passed for the Sid condition. However your query should be rewritten in this way string cmdText = “select Count(*) from [user] where Sid=@sid and password=@pwd”; SqlCommand cmd = new SqlCommand(cmdText, cnn) cmd.Parameters.AddWithValue(“@sid”, textBox1.Text); cmd.Parameters.AddWithValue(“@pwd”, textBox2.Text); int count = Convert.ToInt32(cmd.ExecuteScalar()); if (count … Read more
You are selecting columns, like FN, SN and Caps. I suppose that if you group by Team, at least one of those columns have more than one value in at least a group. solved How to do a group by query in c++