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 field = (((1 << 4) - 1) << 8);  //create field of 1s

    reg &=  ~field; //empty field on the reg

    reg |= ((baud & (1 << 4) - 1) << 8); //add in the value in the cleared field 
    return reg;
}

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