23. Set Baud Rate Field in Control Register

#include <stdio.h>
#include <stdint.h>

#define BIT_BUAD_RATE_START (8)
#define BIT_BUAD_RATE_NUM   (4)

uint32_t set_baud_rate(uint32_t reg, uint8_t baud) {
    uint32_t mask = (((1 << BIT_BUAD_RATE_NUM) - 1) << BIT_BUAD_RATE_START);
    reg = ((reg & ~(mask)) | (((uint32_t)baud << BIT_BUAD_RATE_START)) & mask);
    return reg;
}

int main() {
    uint32_t reg;
    uint8_t baud;
    scanf("%u %hhu", &reg, &baud);
    printf("%u", set_baud_rate(reg, baud));
    return 0;
}