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#include <iostream>

using namespace std;

//从src开始dump size个字节的内存数据到dst，自行保证dst可用
void hex_dump(const unsigned char *src, unsigned char *dst, int size) {
	for (int i = 0; i != size; ++i) {
		unsigned char rignt  = src[i] % 16;
		unsigned char left = src[i] >> 4;
		if (left >= 0 && left <= 9) {
			dst[2*i] = left + '0';
		} else if (left >= 10 && left <= 15) {
			dst[2*i] = left - 10 + 'A';
		}
		if (rignt >= 0 && rignt <= 9) {
			dst[2*i+1] = rignt + '0';
		} else if (rignt >= 10 && rignt <= 15) {
			dst[2*i+1] = rignt - 10 + 'A';
		}
	}
}
int main () {
	int a = 0x12345678;
	char dst[9] = {};
	hex_dump((unsigned char *)&a, (unsigned char *)dst, 4);
	cout << dst;
}