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

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

uint32_t update_register(uint32_t reg) {
    // Extract Bit Field
    uint32_t value = (reg >> 10) & ((1U << 5) - 1);

    // Check if value is less than 31
    if(value < 31){
        value += 1;
    }
    
    // Mask
    uint32_t mask = ((1 << 5) -1) << 10;

    // Clear those bits
    reg &= ~mask;

    // Update with incremented value
    reg |= (value << 10);
    return reg;
}

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