output char array with snprintf

Projects Programming
1

How can I easily output all elements of an array in a snprintf function?

// this is the way for Serial output 
int temperatureNumDevices = 5; 
 
for (int i=0; i<temperatureNumDevices; i++) {
 Serial.print(temperatureArrayChar[i]);
}

and I can this do with snprintf by defining every single array element in sprintf

snprintf(buffer, size, "%s,%s,%s,%s,%s", temperatureArrayChar[0], temperatureArrayChar[1], temperatureArrayChar[2], temperatureArrayChar[3], temperatureArrayChar[4]);

But I want do something like

snprintf(buffer, size, "%s,[x temperatureNumDevices]", temperatureArrayChar[0 to temperatureNumDevices]);

to have the code flexible in case temperatureNumDevices is changing. Can I do this in snprintf directly or do I have to make some helper variables with the values of the array?

2

You will not be able to have it the way you want it, because "0 to temperatureNumDevices" is no valid C-expression,
but you could write a routine, that supplies the functionality you are looking for, something like

int xsnprintf(char* buff, int len, char* verySpecialFormat, void* arrayData, int elements);
3

you could try to build a buffer, concatenating each value using a for loop interspersed with commas and then null-terminate it.

then print it like any C string...