you cast（char *）to（int）。你应该做的是将指针转换为整数，例如这样：

you cast (char*) to (int). What you should do is cast to pointer to integer, ie something like this:

t_num = *((int*) s_num));

但你真的应该把你的代码提取到自己的函数中，并确保

But really you should extract your code into it's own function and make sure that

1. 字元序列正确


2. sizeof（int）== 4


3. 新C ++类型