How do I add a variable in assembly language?

A variable declaration starts with a label definition (the name of the variable), followed by a . word directive, followed by the initial value for the variable. The assembler supports a fairly flexible syntax for specifying the initial value. For now, we will use simple integer values to initialize our variables.

What are the data types in assembly language?

Assembly data types limits and examples

• BYTE – 8 bit unsigned integer.
• SBYTE – 8 bit signed integer.
• WORD – 16 bit unsigned integer.
• SWORD – 16 bit signed integer.
• DWORD – 32 bit unsigned integer.
• SDWORD – 32 bit signed integer.
• FWORD – 48 bit integer.
• QWORD – 64 bit integer.

Are there multiple assembly languages?

There are many many assembly languages…a lot more than two. Each CPU architecture has its own machine language. There are many different CPU architectures , including those for microcomputers, embedded microcontrollers, high-performance workstations and servers, minicomputers, and mainframes.

Does Assembly have data types?

Assembly language defines intrinsic data types, each of which describes a set of values that can be assigned to variables and expressions of the given type. The essential characteristic of each type is its size in bits: 8, 16, 32, 48, 64, and 80.

How does add work in assembly?

The add instruction adds together its two operands, storing the result in its first operand. Note, whereas both operands may be registers, at most one operand may be a memory location. The inc instruction increments the contents of its operand by one.

How does assembly language store data?

You can load and store registers using LDR , STR and MOV (register) instructions. You can load any 32-bit value from memory into a register with an LDR data load instruction. To store registers into memory you can use the STR data store instruction.

Is assembly different for each processor?

An assembly language is a low-level computer language whose instructions correspond directly to the machine language instructions of a specific processor type. Because each processor type’s instruction set is unique, assembly languages are necessarily different among processor types.

What does data mean in assembly code?

The data section is used for declaring initialized data or constants. This data does not change at runtime. You can declare various constant values, file names, or buffer size, etc., in this section.

What are Assembly directives?

Directives are instructions used by the assembler to help automate the assembly process and to improve program readability. Examples of common assembler directives are ORG (origin), EQU (equate), and DS. B (define space for a byte). Directives are used essentially in a pre-processing stage of the assembly process.

How do you add two binary numbers in assembly language?

Adding 2 binary numbers uses the same method as adding decimal numbers. The only difference is that in decimal when you add each pair of digits, if the sum is greater than 9, you carry the 10 to the next column. In binary when the sum is greater than 1, then you carry the 2 to the next column.