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(int i=pos;i<pos+len;i++) {
        reg&=~(1<<i);
        // this clears the target bit of the register
        // now set the bit if it is set in the value
        if(val>>(i-pos)&1)
            reg|= (1<<i);
    }
    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;
}

// 
// X_1 -> 1
// X_0 -> 0
// 0 1 1
// 1 1 1
// 0 0 0
// 1 0 0
// there is no such operation
// so clear bits first

Solving Approach