Using floats with sprintf() in embedded C

Question

Guys, I want to know if float variables can be used in sprintf() function.

Like, if we write:

sprintf(str,\"adc_read = %d \         


        

Answer 1

Don't do this; integers in C/C++ are always rounded down so there is no need to use the floor function.

char str[100]; 
int d1 = value;

Better to use

int d1 = (int)(floor(value));

Then you won't get rounding up of the integer part (68.9999999999999999 becomes 69.00..). 68.09999847 instead of 68.1 is difficult to avoid - any floating point format has limited precision.