26. Extract and Modify Field in a 32-bit Register

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

#define MASK 0x1F

uint32_t update_register(uint32_t reg) {

    uint32_t mask = MASK; //create 8bit mask of 0001 1111 to extract

    uint32_t val = ((reg >> 10) & mask);  // shift mask 10, 
                                         // set val equal to reg 10-14


    if(val < 31){ val++; }//inc if < 31

    reg &= ~(mask << 10); //clear bits 10-14
    reg |= (val<< 10);   //set to val 

    return reg;
}

int main() {
    uint32_t reg;
    scanf("%u", &reg);
    uint32_t updated = update_register(reg);
    printf("%u", updated);
    return 0;
}