緣由：批量把特別長的16進位制字串，轉成10進位制，而excel轉完會缺失很多位。

下面是C++程式碼，執行完，斷點檢視轉換結果，或者打印出來也行

 1 /*
 2 * 將十六進位制數字組成的字串（不包含字首0x或0X）轉換為與之等價的整型值
 3 */
 4 #include <stdio.h>
 5 #include <iostream>
 6 #include <string>
 7 #include <vector>
 8 #include <math.h>
 9 using namespace std;
10 /* 將十六進位制中的字元裝換為對應的整數 
 
*/
11 long long hexchtoi(char hexch)
12 {
13     char phexch[] = "ABCDEF";
14     char qhexch[] = "abcdef";
15     for (long long i = 0; i < 6; i++)
16         if ((hexch == phexch[i]) || (hexch == qhexch[i]))
17             return 10 + i;
18 
19     return hexch-48; /* 非十六進位制字元 */
20 }
21 long long htoi(const
 
 char s[])
22 {
23     long long n = 0; /*有n位*/
24     long long i = 0;
25     long long answer = 0;
26     /* 有效性檢查 */
27     while ((s[i] != '\0')) {
28         if ((s[i] < '0') && (s[i] > '9'))
29             if (hexchtoi(s[i]) >= 0)
30                 return 0;
31         n++;
32         i++;
 
33     }
34     for (long long j = 0; j < n; j++)
35         answer += ((long long)pow(16, j) * hexchtoi(s[i - j - 1]));
36 
37     return answer;
38 }
39 int main()
40 {
41     vector<const char*> vecInput;
42     vecInput.push_back("11F000000000233C");
43     vecInput.push_back("11F000000000100B");
44     vecInput.push_back("11F00000000007A8");
45     vecInput.push_back("11F000000000145B");
46     vecInput.push_back("11F0000000000F18");
47     vector<long long> vecRes;
48     for (size_t i = 0; i < vecInput.size(); i++)
49     {
50         vecRes.push_back(htoi(vecInput[i]));
51     }
52     printf("-------stop----------");
53 }