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 field (bits 10–14)
    uint32_t mask = 0x1F << 10;        // 5 bits at position 10
    uint32_t field = (reg & mask) >> 10;

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

    // Step 3: Clear old field
    reg &= ~mask;

    // Step 4: Write 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