C - unsigned int to unsigned char array conversion

#include <iostream>
#include <bitset>

unsigned int num = 42;
unsigned char arr[32]; // 假设我们想要将num转换为32位无符号字符数组

std::bitset<32> bset(num);
for (int i = 0; i < 32; ++i) {
    arr[i] = bset[i];
}

#include <iostream>
#include <string>

unsigned int num = 42;
unsigned char arr[32];

std::string str = std::to_string(num);
for (int i = 0; i < 32; ++i) {
    arr[i] = str[i];
}

#include <iostream>
#include <vector>

unsigned int num = 42;
unsigned char arr[32];

std::vector<unsigned char> vec(num);
for (int i = 0; i < 32; ++i) {
    vec[i] = arr[i];
}