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

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

uint32_t update_register(uint32_t reg) {
    uint32_t pos = 10;
    uint32_t len = 5;

    uint32_t mask = (1U<<len)-1; // for lsb 1111
    uint32_t result = (reg>>pos) & mask; // did the first extraction 
    
    if(result<31){
        result++;
    }
    reg &= ~(mask<<pos);  // clear bit field
    reg |= (result<<pos);  // final set bit 

    return reg;
}

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