23. Set Baud Rate Field in Control Register

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

uint32_t set_baud_rate(uint32_t reg, uint8_t baud) {
    uint32_t mask = 0xFU << 8;
    reg &= ~(mask);
    uint32_t non_pos = 8;
    for(int i = 0; i<4; i++)
    {
        uint32_t bit = (baud >> i) & 1U;
        bit = (bit << non_pos++);
        reg |= bit;
    }
    return reg;
}

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