How do you find the factorial of a number in assembly language?

How do you find the factorial of a number in assembly language?

Algorithm –

1. Input the Number whose factorial is to be find and Store that Number in CX Register (Condition for LOOP Instruction)
2. Insert 0001 in AX(Condition for MUL Instruction) and 0000 in DX.
3. Multiply CX with AX until CX become Zero(0) using LOOP Instruction.
4. Copy the content of AX to memory location 0600.

How do you find the factorial of a number?

To find the factorial of a number, multiply the number with the factorial value of the previous number. For example, to know the value of 6! multiply 120 (the factorial of 5) by 6, and get 720. For 7!

How do you find the factorial of a microprocessor?

Explanation –

1. First set register B with data.
2. Set register D with data by calling MULTIPLY subroutine one time.
3. Decrement B and add D to itself B times by calling MULTIPLY subroutine as 4*3 is equivalent to 4+4+4 (i.e., 3 times).
4. Repeat the above step till B reaches 0 and then exit the program.

How do I program 8086?

8086 microprocessor assembly language programs

1. Write a Program For Read a Character From The Keyboard.
2. Write a Program For Reading and Displaying a Character.
3. Write a Program Using General Purpose Registers.
4. Write a Program For Displaying The String Using Library Functions.
5. Arithmetic and Logic Instructions.

How does MUL work in assembly?

The MUL (unsigned multiply) instruction multiplies an 8-, 16-, or 32-bit operand by either AL, AX, or EAX. The Carry flag indicates whether or not the upper half of the product contains significant digits.

Why we use ORG 0100h in 8086 programming?

ORG means origin ORG is used for specific addressing in microprocessor and microcontroller programming. This means we want to start our program from the 0000H address. its the location in memory where you want the binary program to be loaded to, if any.

What is DB in assembly language?

In assembly language, we use “db” (data byte) to allocate some space, and fill it with a string. You can actually pull out the bytes of the string directly from memory like below, for example to print their ASCII values as a number, like 0x4E for ‘N’.

What is ORG 0x0100 in assembly language?

The org command tells the program where to load itself into in memory (ram). In particular this command says to start the program at 100 bytes.

What is directives in assembly language?

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.

What are the advantage of assembly language?

Advantages and Disadvantages It allows complex jobs to run in a simpler way. It is memory efficient, as it requires less memory. It is faster in speed, as its execution time is less. It is mainly hardware-oriented.

Which directive is used to indicate the beginning of the address?

Explanation: The directive SEGMENT indicates the beginning of the segment. Explanation: In this, the recurring/repeating value is assigned with a label. The label is placed instead of the numerical value in the entire program code.

Which type of errors are detected by the assembler?

Syntactical Errors are detected by Assemblers.