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) {
    // Your code here len = 4 bits, position start at 8
    // mask = (1U << len) -1 
    // reg &= ~(mask << pos)
    uint32_t mask = (1U << 4) -1; 
    reg &= ~(mask << 8); // clear bits 8 to 11
    reg |= (baud & mask) << 8; // insert
    return reg;
}

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