how can i display the numbers till the entered by user number?
for example, if the input is 9, it displays 0,1,2,3,4,5,6,7,8,9
MSVisual studio, c#
thanks!
int input = Int32.parseInt(Console.ReadLine());
for(int i = 0; i<=input; i++){ //for loop
Console.WriteLine(i);
}
Related
I'm trying to concatenate the current DateTime to my devices Mac Address in the following format: aa:bb:cc:dd:ee:ffYYmmDDhhMMss so I can hash it and send it to a web service every time I collect new data (so I'll have to hash it in every loop)
I managed to concatenate the two values (mac address + datetime) and converted it to char array
addressDateTime.toCharArray(thisThing, 28);
However, I'm kind of lost as to how to continue.
I've also tried to read the resulting char* with this cycle but I'm not understanding why it doesn't work:
void loop() {
while (!timeClient.update()) {
timeClient.forceUpdate();
}
String addressDateTime = getPayload(); //this gets the *aa:bb:cc:dd:ee:ffYYmmDDhhMMss* string
char* hashThis;
addressDateTime.toCharArray(hashThis, 28);
for (int i = 0; i < sizeof(hashThis); i++) {
char str[3];
sprintf(str, "%02x", hashThis[i]);
Serial.print(str);
}
delay(5000);
}
Am I converting the String to char* correctly?
How should I go about Hashing the char*?
Or can I Hash the String without converting it to to char*?
Update:
My code's looking like this atm
while (!timeClient.update()) {
timeClient.forceUpdate();
}
String addressDateTime = getPayload();
char hashThis[30];
addressDateTime.toCharArray(hashThis, 30);
for (int i = 0; i < sizeof(hashThis); i++) {
Serial.printf("%02x", hashThis[i]);
}
delay(5000);
}
So I managed to convert the String to Char* Except that the output is looking like this 33433a37313a42463a31443a34323a463431393035303531343038323700 instead of (for example) aa:bb:cc:dd:ee:ff190505141037
After figuring out why my char* array outputs like that I still have to hash it.
Thanks for helping me get this far, I still have ways to go
You're not allocating space to store the C string that you're getting from addressDateTime.
hashThis is a char* which is a pointer to a character. It hasn't been set to anything so it's just... random. Which will almost certainly make your program crash or at least misbehave badly.
Given your code, the quickest fix is to change
char* hashThis;
to
char hasThis[30];
addressDateTime.toCharArray(hashThis, 30);
I changed 28 to 30 because aa:bb:cc:dd:ee:ffYYmmDDhhMMss is actually 29 characters long and also requires an extra byte for the C string null terminator character. I'm not 100% sure if the toCharArray() method sets the null terminator; if it doesn't, you'd need to add
hasThis[29] = '\0';
You can avoid that by just using the String c_str() method, which returns a char* to the internal buffer that String uses to hold the string.
In that case you could rewrite
char* hashThis;
addressDateTime.toCharArray(hashThis, 28);
as
char* hashThis = addressDateTime.c_str();
By the way, you can also just do
Serial.printf("%02x", hashThis[i]);
and dispense with the snprintf(). Kudos on getting the right buffer size there, though!
UPDATE
In your updated question, you said that you're expecting to see output that looks like:
aa:bb:cc:dd:ee:ff190505141037
instead of:
33433a37313a42463a31443a34323a463431393035303531343038323700
Your code is
for (int i = 0; i < sizeof(hashThis); i++) {
Serial.printf("%02x", hashThis[i]);
}
You're writing each character as a two digit hexadecimal number, so you're going to see the number in hexadecimal that represents the character, not the character itself. If you want to see the characters, do:
for (int i = 0; i < strlen(hashThis); i++) {
Serial.printf("%c", hashThis[i]);
}
or (better)
for (int i = 0; i < strlen(hashThis); i++) {
Serial.print(hashThis[i]);
}
or (best)
Serial.println(hashThis);
Note that I changed your sizeof to a strlen. If for some reason you put a shorter string in hashThis, strlen will do the right thing whereas sizeof will always return the length that hashThis was declared with rather than the length of the string in it.
I am trying to send from max msp some values. I have no problem in receiving them however, when I try to send multiple values at one I have some troubles. Is there a way to get multiple values?
using the code below I am getting :
> pixelNum: 10 pixelState: 0 pixelNum: 1 pixelState: 0
void loop() {
OSCMessage msgIN;
int size;
if((size = Udp.parsePacket())>0){
while(size--)
msgIN.fill(Udp.read());
if(!msgIN.hasError()){
msgIN.route("/pixelAni",pixelAni);
}
}
}
void pixelAni(OSCMessage &msg, int addrOffset){
int pixelNum = msg.getInt(0);
int pixelState = msg.getInt(1);
Serial.println("pixelNum: ");
Serial.println(pixelNum);
Serial.println("pixelState: ");
Serial.println(pixelState);
pixels[pixelNum].R = 255;
pixels[pixelNum].G = 255;
pixels[pixelNum].B = 255;
ledstrip.show(pixels);
}
So many options! The simplest would be the pack object, when it receives an input to its left most inlet it will output. Since max data flows Top to Bottom and Right to Left, this should gaurantee that you allways output both numbers
You could use the buddy or thresh objects to sync up the messages if you cant guarntee they arrive at exactly the same time
I am writing PIC code in C and encountered the following problems:
When I write my delay as _delay_ms(500), my code doesn't compile, it says it didn't recognize this instruction. I am using MPLAB.
I want to write a program that would count how many time the push button is pressed then return that value and display it using LED's. I know how to display it, but not how to make the program to wait for the push of the push button on the pickit.
main()
{
TRISA=0;//Sets all ports on A to be outputs
TRISB=1;//Sets all ports on B to be inputs
for(;;){
if(PORTBbits.RB0==1){//When the button is pressed the LED is off
PORTAbits.RA1 =0;
count=count+1;
}
else{
PORTAbits.RA1=1;
count = count +1;
}
if (count > 20){//if count =20 aka 20 button presses the LED turns on
PORTAbits.RA0=1;
}
else{
PORTAbits.RA0=0;
}
}
}
There are a few issues:
Assuming you're using a PIC24 or a dsPIC, you need to include libpic30.h
Before you include libpic30.h you need to #define FCY to be your instruction rate so that the delay takes the correct number of cycles. See the comments in the libpic30.h file for details.
The function is __delay_ms not _delay_ms. Note that there are two underscores at the beginning.
The name is all lower case, not Delay_ms as in your comment.
You need to add delay in your code when you detect a key is pressed. As you are saying the _delay_ms(500) is not recognized, You can try something like following:
unsigned char x;
// Just waste a few cycles to create delay
for (x = 0; x < 100; x++)
{
// No operation instruction
Nop();
}
You can create your own delay function with specific number of iterations of this for loop. Measure the exact delay created by this function using a profiler if you need. IMO any arbitrary delay, like say 100 iterations as stated above shall work.
I have the same code in 2 different projects. The Qstring::number(data.toLong(&ok,2),16) works in one project and in the other project it does not work. Does anyone know what the reason could be? The code is as follows
1) unsigned short status;
2) long int setting;
3) bool ok;
4) QString data_selected;
5) data_selected = lineEdit_data->text(); //get the binary value
6) data_selected = QString::number(data_selected.toLong(&ok, 2), 16); //convert binary value to hex value
7) setting = data_selected.toLong(&ok, 16); //convert string to integer
In line 5 I am getting data from a lineEdit. This line works fine. I just inserted a new text edit box and displayed the data there and there I can see data. I have data as "1000000000001000". Then I execute line 6, the output of which is '8008' in first case and '0' in the other project. This is the problem. The code is exactly the same. I have copied and pasted. But in debugging I can see this difference. Please can anyone tell me why this is happening?
I thought that comment under answer was clear.
Correct code like this to detect what is the problem:
ulong setting;
bool ok;
data_selected = data_selected.trimmed(); // first try without this line
ulong value = data_selected.toULong(&ok, 2);
if (ok) {
data_selected = QString::number(value, 16);
setting = data_selected.toULong(&ok, 16);
} else {
data_selected = "convertion error";
}
i want to set my font as bold in particular row column position of my tablewidget.
I did like this but getting break.
QFont font("Helvetica", 12, QFont::Bold);
overviewTable->item(2,2)->setFont(font);
Please Help
I think everything is ok. Here what docs said:
void QTableWidgetItem::setFont ( const QFont & font )
Sets the font used to display the item's text to the given font.
Maybe your overviewTable const?
ADDED:
This variant works fine for my Qt 4.6:
tableWidget = new QTableWidget(12, 3, this);
for (int i = 0; i < 12; i++) {
for (int j = 0; j < 3; j++) {
QTableWidgetItem *newItem = new QTableWidgetItem(tr("%1").arg(
(i+1)*(j+1)));
tableWidget->setItem(i, j, newItem);
}
}
QFont font;
font.setBold(true);
tableWidget->item(2, 2)->setFont(font);
Maybe you are getting break because you didn't call setItem() to set an item for the cell (2, 2) before you use overviewTable->item(2,2). As the Qt document says,
QTableWidgetItem * QTableWidget::item(int row, int column) const
Returns the item for the given row and column if one has been set;
otherwise returns 0.
That is, your overviewTable->item(2,2) probably returns 0, thus causes a Segmentation fault in the setFont() call.
So your means to setting font is completely right. You just need to call setItem() at first as mosg's answer suggests.
ADDED:
if your overviewTable is a QTableWidget created in Qt Designer, then in the Designer a double-click on a cell (just to enter its editing mode, no need to actually enter anything) will have the effect of calling setItem() for that cell. Later in your code you can directly using the item() function without having to call setItem() first.