UINT16_MAX --Constant representing the maximum value of uint16_t
UINT16_MAX is a constant that represents the maximum value of uint16_t. This is the constant macro introduced in C99.
#include <stdio.h>
#include <stdint.h>
int main (void) {
printf("%u\n", UINT16_MAX);
}
"%U" is used in the format specifier of printf function.
The output value of UINT16_MAX.
65535
C Language Zemi