gistfile1.cpp

int VirtualMemoryManager::convert_from_hex(string h) {
	h = h.substr(2); //truncate the 0x portion
	
	int result = 0;
	//magic, converts to int, stores in result
	sscanf(h.c_str(), "%x", &result);
	
	return result;
}


int VirtualMemoryManager::get_segment(int ins) {
	return (ins >> 6) & 3;
}

int VirtualMemoryManager::get_page(int ins) {
	return (ins >> 4) & 3;
}

int VirtualMemoryManager::get_offset(int ins) {
	return ins & 15;
}

Try this:

#include <stdio.h>

int main() {
    int result;
    sscanf("0xFF", "%x", &result); /* can handle the 0x in front */
    printf("%d\n", result);
    return 0;
}