23. Set Baud Rate Field in Control Register

#include <stdio.h>
#include <stdint.h>
#define NUM 4
#define POS 8
uint32_t set_baud_rate(uint32_t reg, uint8_t baud) {
    uint32_t mask = (1U<<NUM)-1;
    reg &=~ (mask<<POS);
    reg |= ((baud&mask)<<POS);
    return reg;
}

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