Question

If I use a whole number in #define, what data type is it considered to be in sprintf() in C99 ?

#define NUMBER 100

sprintf(buf, "%i\n", NUMBER); // is it %i, %u, %lu ?

Answer 1

#define NUMBER1 100 /* int: use "%d" or "%i" in printf() */
#define NUMBER2 100U /* unsigned int: use "%u" in printf() */
#define NUMBER3 100L /* long int: use "%ld" or "%li" in printf() */
#define NUMBER4 100UL /* unsigned long int: use "%lu" in printf() */
/* C99 */
#define NUMBER5 100LL /* long long int: use "%lld" or "%lli" in printf() */
#define NUMBER6 100ULL /* unsigned long long int: use "%llu" in printf() */

Note: the U and L can also be in lowercase
Note2: the U can come before or after the L or LL