How to read and show data?

[johannw]

my code converts a lowercase sentence to uppercase. I already declared the message in the program. I'd like to introduce the message by typing the keyboard, so how can I achieve this?
Here is my code:
/*
*Autor: Johann Whight
*lowercase to uppercase sentence converter
*/
int i;
void setup()
{
Serial.begin(9600);
char texto[] = "hi everyone";
for (i = 0; texto[i]; i++)
{
texto[i] = toupper(texto[i]);
}
Serial.println(texto);
}
void loop()
{
}

[Whandall]

void setup() {
  Serial.begin(9600);
}
void loop() {
  if (Serial.available()) {
    char got = Serial.read();
    if (islower(got)) {
      got = toupper(got);
    }
    Serial.write(got);
  }
}

If lowercase convert to upper, echo unchanged if not.

[J-M-L]

The test is not really necessary (won't hurt, looks good ), as toupper() of something that is already uppercase has no negative impact... so you can go with just

void setup() {
  Serial.begin(115200);  // serial monitor at 115200 bauds
}

void loop() {
  if (Serial.available()) Serial.write(toupper((char) Serial.read()));
}

This will work with standard ASCII, so you can't deal with é, à, ô etc
--> if you are using UTF8 beyond simple ASCII, then you need more code and it's not as easy

[johannw]

Thanks a million my friend, yeah the standard ASCII is really helpfull, I forgot it. Really thanks a million

[johannw]

Thanks a million my friend, now I can see what are my mistakes, really thanks a million your answer is so helpfull....