How can i saperate a String with comma's

Projects Programming
1

Hi ,
I am trying to separate a String with comma's in different variables

    String coin1 = "bitcoin,2,0.01234";
    String coin;
    int decimal;
    float holding;

where bitcoin is my coin , 2 is decimal point & 0.01234 is my holding.
I am trying with strtok() , but no good luck yet.

2

strtok() is used with C-strings (arrays of chars terminated by a zero). These are not Strings, which are objects of the String library

The String library has the indexOf() function that allows you to find teh position of sub Strings, such as a ","

The general advice on the forum is to use strings rather than Strings in the limited memory of most microcontrollers

3

Hi, Thanks for quick response.
What else i can use for my requirement ?

can you help ?

4

My advice would be to use C strings and to use strtok()

5

Then you must have seen examples of using strtok, right? Pretty sure they don’t have String

6

string - char array
vs.
String - object

7

I didn't do everything. I left some fun for you.

char coin1[] = "bitcoin,2,0.01234";
float holding;
float bonus = 100.1;   // just for fun

char scan;
byte idx = 0;
byte comma1;
byte comma2;

//char field1[10];
//char field2[3];
char field3[10];

byte f3;
byte LL;

void setup() 
{
  Serial.begin(19200);
  Serial.println("Go!");
}

void loop() 
{
  LL = strlen(coin1);
  idx = 0;
  
  findCommas ();
  //Serial.println(comma1);
  //Serial.println(comma2);
  
  idx = comma2 + 1;  // comma2 next place is field2=3
  f3 = 0;
  do
  {
    field3[f3] = coin1[idx];
    f3 ++;
    idx ++;
  }while (idx < LL);

  Serial.print("field3 = ");
  Serial.println(field3);
  holding = atof(field3);  // string to float
  holding = holding + bonus;
  Serial.println(holding, 5);
  
  delay(10000);
}

void findCommas ()
{
  do
  {
    scan = coin1[idx];
    idx ++;
  }while(scan != ',');
  comma1 = idx - 1;
  
  idx ++;
  
  do
  {
    scan = coin1[idx];
    idx ++;
  }while(scan != ',');
  comma2 = idx - 1;
}

I used "c strings".
Might be better ways to do it, just a sort of demo.
c strings and atof() are key.

8

Can any of those fields in the comma separated list be empty, for example "bitcoin,,0.01234" ?