Extract and Modify Field in a 32-bit Register

Code

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

uint32_t update_register(uint32_t reg) {
    uint8_t a=0;
    for(int i=0;i<5;i++){
      a |= ((reg>>(i+10)) &1)<<i;

    }
    if(a<31) {a=a+1;}
    for(int i=0;i<5;i++){
      reg &= ~(1<<(i+10));
      reg |= ((a>>(i)) &1)<<(i+10);

    }
    return reg;
}

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

Solving Approach