Ardunio String Resaginment

Projects Programming
1

Hi I am here for a school project i am working on some strings I can't get strings to be reasignned

String string1 = "Ace";
Serial.print(string1);
string1 = "Queen";
Serial.print(string1);

This just keeps giving me ace and not queen thx for the help

I know char exist but people keep telling me it is meant for a single charchetr is there anyway without using replace as that ruins my code

2

Posting a snippet is not useful.

Posting a complete sketch that illustrates the problem in question, is.

Or, in this case, posting a complete sketch that illustrates that there is no problem, is.

Sketch:

void setup() {
   Serial.begin(115200);
   
   String string1 = "Ace";
   Serial.print(string1);
   string1 = "Queen";
   Serial.print(string1);
}

void loop() {
}

Output:

AceQueen

QED

3

Thank you that fixed it

4

Those people are confused, so you may be asking in the wrong places.
See C Library – <string.h> | GeeksforGeeks

void setup() {
   Serial.begin(115200);
   while(!Serial) delay(1); //wait for connection
   
   char string[30];  //room for 29 characters plus terminating zero
   
   strcpy(string,"Ace");
   Serial.println(string);
   strcpy(string,"Queen");
   Serial.println(string);
}

void loop() {
}

Prints

Ace
Queen

5

What was wrong with your original sketch ?

1 Like
6

Something else OP did not share :slight_smile:

The snippet from the first post is correct so I suspect an issue with scope and redefinition of the variable in another function or compound statement and then loosing that scope and printing again the original variable

Something like

String string1 = "Ace";
Serial.print(string1);
if (someCondition) {
  String string1 = "Queen";
} else {
  String string1 = "King";
}
Serial.print(string1);

To @28ri0203 - if that is close to what you had or never heard about the word scope, it’s time to read about scope

1 Like
7

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