C++ 超大数字的运算——求100的阶乘

    uint8_t arr[1000];
    memset(arr, 0, sizeof(arr));
    arr[0] = 1;
    for(int i = 1; i <= 100; ++i)
    {
        int lastCal = 0;
        for(int j = 0; j < sizeof(arr); ++j)
        {
            int res = arr[j] * i + lastCal;
            arr[j] = res%10;
            lastCal = res/10;
        }
    }
    cout << "result:" << endl;
    bool printFlag = false;
    for(int i = sizeof(arr) - 1; i >=0; --i)
    {
        if(arr[i] > 0)
            printFlag = true;
        if(printFlag)
            cout << (int)arr[i];
    }
    cout << endl;