24. Data Transmission

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

uint32_t clear_range(uint32_t reg, uint8_t start, uint8_t end) {
    uint32_t mask = 0x00000000;
    for (uint8_t i = start; i <= end; i++) {
        mask |= (1U << i);
    }
    reg &= ~mask;
    return reg;
}

uint32_t extract_field(uint32_t reg, uint8_t pos, uint8_t len) {
    reg = clear_range(reg >>= pos, len, 31);
    return reg;
}

void convert_to_big_endian(uint32_t value, uint8_t arr[4]) {
    // Your code here
    uint32_t temp_value;
    for(uint8_t i = 0; i < 4; i++){
        temp_value = value;
        arr[i] |= (uint8_t)extract_field(temp_value, 24 - 8*i, 8);
    }
}

int main() {
    uint32_t value;
    uint8_t arr[4];
    scanf("%u", &value);
    convert_to_big_endian(value, arr);
    for (int i = 0; i < 4; i++) {
        printf("%u", arr[i]);
        if(i<3){
            printf(" ");
        }
    }
    return 0;
}