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
    int bit_mask = (((1U<<len)-1) <<pos); //creating a bit mask of desired no of 1's in desired place
    reg = reg & (~bit_mask); //clearing the bits which are to be replaced with the given value
    val = (val<<pos); // bringing the bits to the right posiiton
    reg |=val; //replacing the bits with the given value
    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