sprintf

[Guddleif]

Hello.

I have two uint8_t values that i would like to combine in a char array. I know I can use sprintf to store one of them in a char array, like shown below. How do i append the other one?

Thanks a lot for helping me out

uint8_t adc_readingL = 174;
uint8_t adc_readingH = 236;
unsigned char adc_reading_chars[4];
sprintf(adc_reading_chars, "%i", adc_readingL);

[mike65535]

sprintf works sort of like printf, just add more %i terms

[Guddleif]

Thanks for the quick reply! so like this:? Also array length of 6 is sufficient, right? The values will never be above 255

unsigned char adc_reading_chars[6];
sprintf(adc_reading_chars, "%i", adc_readingL, "%i", adc_readingL);

[hk_mp5kpdw]

If both values are at most 3 digits long, then you will need a minimum of 7 characters for your array - 3+3+1 (for the null terminating character) - in order to be safe.

char adc_reading_chars[7];
sprintf(adc_reading_chars, "%i%i", adc_readingL, adc_readingL);

[Guddleif]

Thanks

[stahta01]

If your system supports "snprintf" it is safer that "sprintf".

Tim S.