如果累加器内容是负数，分支到操作数指定的地址。
JPN Branch to the address specified by the operand if the contents of the accumulator are negative.
现在让我们看一下如何将个别寄存器作为操作数的约束指定。
Now let's take a look at how to specify individual registers as constraints for the operands.
它将第二个操作数内的寄存器与第三个操作数内的常量加在一起，并将结果存储在第一个操作数内指定的寄存器中。
It adds together the register in the second operand with the constant in the third operand, and stores the result in the register specified in the first operand.
因为y是在输出操作数部分中指定的，所以 %edx中更新的值存储在-8(%ebp)，堆栈上 y 的位置中。
Since y is specified in the output operand section, the updated value in %edx is stored in -8(%ebp), the location of y on stack.
intel语法通过在内存操作数(而不是操作码本身)前面加byte ptr、word p tr和dwordptr来指定大小。
Intel syntax accomplishes this by prefixing memory operands (not the opcodes themselves) with byte PTR, word PTR, and dword PTR. Thus.
大多数指令都遵循类似的格式，结果存储在第一个操作数内指定的寄存器中。
Most instructions follow a similar format, with the register that holds the result specified in the first operand.
如果操作数的大小未在指令中指定，这就意味着操作数的大小并不十分重要(例如逻辑指令)或者它的大小为32位。
If the size of the operand is not specified in the instruction, that means either that the size doesn't matter (as in logical instructions, for instance) or that it is using a 32-bit value size.
数据模型将指定用于操作数据的信息和规则。
The data model will specify the information and the rules that you can use to operate on that data.
当指定为ON时，如果串联操作的两个操作数中任意一个为NULL，则结果也为NULL。
When ON is specified, the result of a concatenation operation is NULL when either operand is NULL.
点操作符仅应用于类类型的对象：左操作数必须是类类型的对象，右操作数必须指定该类型的成员。
The dot operator applies only to objects of class type: the left-hand operand must be an object of class type; the right-hand operand must name a member of that type.
当操作指定了“r”限制符，那么操作数将会被存储在通用寄存器内。
When operands are specified using this constraint, they get stored in General Purpose Registers(GPR).
主要是练习VC操作数据库，包括添加、删除、修改、查询指定记录等基础类操作。
VC operation of the database are mainly exercises, including add, delete, modify, specify the records and other basic category of operations.
主要是练习VC操作数据库，包括添加、删除、修改、查询指定记录等基础类操作。
VC operation of the database are mainly exercises, including add, delete, modify, specify the records and other basic category of operations.
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