Addition of 2 char

Projects Programming
1

i have 2 questions here.

void AndeeHelper::setData(char* title)

Does the above code allow me to perform setData(char) and display an array of character? My objective is to display a string, which i intend to display using char array.

char tableSelect;
char locationStatus[6] = "Table ";
char UGVLocation1[sizeof(locationStatus) + sizeof(tableSelect)];

void loop()
{
UGVLocation1 = locationStatus + tableSelect;

locationStatus1.setData(UGVLocation1);
}

The above is a part of my code. The value char of UGVLocation1 is not constant. Therefore, the size of the array is a variable. However, why do i get an error of incompatible types in assignment of 'char*' to 'char [7]' if tableSelect = 1?

Will i be able to display UGVLocation1 in this case with reference to my first question?

Thank you.

2 
char locationStatus[6] = "Table ";

Too small.

However, why do i get an error of incompatible types in assignment of 'char*' to 'char [7]' if tableSelect = 1?

C(++) does not have a copy-assignment operator for arrays. Use strlcpy.

C++ does not have a concatenation operator for arrays of characters (C-style strings). Use strlcat.

3 
char tableSelect;
char locationStatus[6] = "Table ";
char UGVLocation1[sizeof(locationStatus) + sizeof(tableSelect)];

I think UGVLocation1 will always be 7.
locationStatus = 6 bytes 'cause you set it above.
tableSelect is a char so its 1 byte.
Is this what you want?

-jim lee

4

Thanks for the replies.

I want it to display "Table " + an int. That is why i code it to be UGVLocation1 = locationStatus + tableSelect;

Can anyone give an example on how to use strlcat to do concatenation?

5

I want it to display "Table " + an int.

Why concatenate them ?
Output the text then output the int.

Alternatively look at the sprintf() function to get both into a single buffer then output the buffer.

6

UKHeliBob:
Alternatively look at the sprintf() function to get both into a single buffer then output the buffer.

snprintf. The n is important. :wink:

7

Only if you are careless ... :slight_smile:

But I agree. It is safer.

8

Only if you are careless ... :slight_smile:

Without it, the function name would be snpritf(), which the linker won't be able to find. So, it is important. 8)

9

What @UKHeliBob said: print your string, and then print your number.