Replace Bit Field in a 32-bit Register

Code

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

uint32_t replace_field(uint32_t reg, uint32_t val, uint8_t pos, uint8_t len) {
    // Your code here
    // for(uint8_t i=0; i<len; i++){
    //     if(((reg>>(pos+i))&1) == 1 && ((val>>i)&1) == 1){
    //         reg |= (1<<(pos+i));
    //     }else
    //     if(((reg>>(pos+i))&1) == 0 && ((val>>i)&1) == 0){
    //         reg &= ~(1<<(pos+i));
    //     }else
    //     if(((reg>>(pos+i))&1) == 1 && ((val>>i)&1) == 0){
    //         reg &= ~(1<<(pos+i));
    //     }else
    //     if(((reg>>(pos+i))&1) == 0 && ((val>>i)&1) == 1){
    //         reg |= (1<<(pos+i));
    //     }
    // }
    uint32_t mask;
    mask = ((1<<len)-1)<<pos;
    reg &= ~mask;
    val = val<<pos;
    reg|= val;
    return reg;
}

int main() {
    uint32_t reg, val;
    uint8_t pos, len;
    scanf("%u %u %hhu %hhu", &reg, &val, &pos, &len);
    printf("%u", replace_field(reg, val, pos, len));
    return 0;
}

Solving Approach