Extract and Modify Field in a 32-bit Register

Code

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

uint32_t update_register(uint32_t reg) {
    // Step 1: Extract 5-bit field at bits 10–14
    uint32_t field = (reg >> 10) & 0x1F;

    // Step 2: Increment if less than 31
    if (field < 31) {
        field += 1;
    }

    // Step 3: Clear old field in register
    reg &= ~(0x1F << 10);

    // Step 4: Insert updated field back
    reg |= (field << 10);

    return reg;
}

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

Solving Approach