What are Arrays in Assembly Language?
An array in assembly language is a contiguous block of memory that contains a series of elements of the same data type. Arrays are used to store data that is related to each other, such as a list of student names or a table of numbers.
To declare an array in assembly language, the programmer uses a directive such as .data or .bss. The directive specifies the name of the array, the data type of the elements of the array, and the number of elements in the array.
Declaration and Initialization
Arrays are declared and initialized using data directives, specifying the size and type of elements.
The following assembly instruction declares an array called my_array that contains 100 integer elements:
The .data directive tells the assembler that the array my_array is located in the data section of the program. The .word directive tells the assembler that the elements of the array are 32-bit integers.
Accessing Array Elements
Once an array has been declared, the programmer can access the elements of the array using an index. The index is a number that identifies the position of the element in the array. The first element of the array has index 0, the second element has index 1, and so on. To access an element of an array in assembly language, the programmer uses the square bracket () operator.
Looping Through Arrays
Loops are commonly used to iterate through array elements, performing operations on each element.
Multidimensional arrays can be simulated by using nested loops and appropriate indexing.
Strings as Arrays
Strings in assembly are often treated as arrays of characters.
Various addressing modes are used to access array elements, including direct addressing and indirect addressing.
Here are some additional examples of how arrays are used in assembly language:
This example shows how to use an array to store a list of names. The loop_students loop iterates over the elements of the array and prints each name to the console.
This example shows how to use an array to store a list of random numbers. The loop_generate_numbers loop generates 100 random numbers and stores them in the array numbers.
Arrays are contiguous blocks of memory used to store and manipulate collections of data. Elements in an array are accessed through indexing, and assembly instructions are employed to iterate through the array, perform operations on its elements, and manage data storage.