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) 
{
    reg&=~(((1<<len)-1)<<pos); //first we should clear the sepcifc bets before we are updating the value,
    reg=reg|(val<<pos); //then shifting the value to required position to update into 32bit value which is received from main function.
    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