unsigned int x1 = 0xaeb1c2aa;
unsigned int x2 = 0xaeb1c2aa;
long long r_whole = (signed long long)x1 * (signed long long)x2;
printf("r_whole = %lld\n",r_whole);
输出的结果是无符号乘法的结果：
r_whole = 8590088583138384100
而下面的程序
unsigned int x1 = 0xaeb1c2aa;
unsigned int x2 = 0xaeb1c2aa;
int xx1 = x1;
int xx2 = x2;
long long r_whole = (signed long long)xx1 * (signed long long)xx2;
printf("r_whole = %lld\n",r_whole);
输出的事有符号乘法的结果：
r_whole = 1860719719092984036
第一段程序里我不是对 x1 进行强制类型转换了吗
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