23. Set Baud Rate Field in Control Register

#include <stdio.h>
#include <stdint.h>
int mark=0;
int sp;
uint32_t set_baud_rate(uint32_t reg, uint8_t baud) {
    mark += reg& ~(0x00000fff);
    sp = baud << 8;
    reg  &= ~(0xffffffff<<8);
    reg = reg + sp;
    reg = reg + mark;
    return reg;
}

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