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程序代码:
struct MyINT64
{
int int32high;
unsigned uint32low;
};
MyINT64 operator+( const MyINT64& a, const MyINT64& b )
{
MyINT64 r;
r.uint32low = a.uint32low + b.uint32low;
r.int32high = a.int32high + b.int32high + (r.uint32low<a.uint32low || r.uint32low<b.uint32low);
return r;
}