我有一个使用多种不同 int 类型的程序。
最常用的是uint64_t和标准int。但是我想知道我是否可以安全地进行它们之间的混合操作。
例如我有一个uint64_t我想添加一个int并将该值存储为另一个值uint64_t.
做这样的事情安全吗？我必须投射int to uint64_t在我可以对其进行操作之前？
我在网上实在找不到有关它的东西。它可能只是被允许，没有人质疑它或者我的谷歌查询是错误的。
无论如何，基本上我的问题是我可以混合不同类型的整数并进行操作吗？
是的你可以。
您的编译器将负责转换。唯一需要担心的是溢出 - 如果您将结果存储在比输入小的容器中。
您需要的 Google 搜索词是“隐式类型转换” - 请参阅示例http://pic.dhe.ibm.com/infocenter/ratdevz/v8r5/index.jsp?topic=%2Fcom.ibm.tpf.toolkit.compilers.doc%2Fref%2Flangref_os390%2Fcbclr21011.htm http://pic.dhe.ibm.com/infocenter/ratdevz/v8r5/index.jsp?topic=%2Fcom.ibm.tpf.toolkit.compilers.doc%2Fref%2Flangref_os390%2Fcbclr21011.htm
该链接包括下表：
算术转换按以下顺序进行：
Operand Type Conversion
---------------------------------------------+--------------------------------------------
One operand has long double type | The other operand is converted to long double type.
---------------------------------------------+--------------------------------------------
One operand has double type | The other operand is converted to double.
---------------------------------------------+--------------------------------------------
One operand has float type | The other operand is converted to float.
---------------------------------------------+--------------------------------------------
One operand has unsigned long long int type | The other operand is converted to unsigned long long int.
---------------------------------------------+--------------------------------------------
One operand has long long int type | The other operand is converted to long long int.
---------------------------------------------+--------------------------------------------
One operand has unsigned long int type | The other operand is converted to unsigned long int.
---------------------------------------------+--------------------------------------------
One operand has unsigned int type |
and the other operand has long int type |
and the value of the unsigned int can be |
represented in a long int | The operand with unsigned int type is converted to long int.
---------------------------------------------+--------------------------------------------
One operand has unsigned int type |
and the other operand has long int type |
and the value of the unsigned int cannot be |
represented in a long int | Both operands are converted to unsigned long int
---------------------------------------------+--------------------------------------------
One operand has long int type | The other operand is converted to long int.
---------------------------------------------+--------------------------------------------
One operand has unsigned int type | The other operand is converted to unsigned int.
---------------------------------------------+--------------------------------------------
Both operands have int type | The result is type int.
---------------------------------------------+--------------------------------------------
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