Computer architecture and assembly language lab 2 Printing

Computer architecture and assembly language lab 2

Printing byte character

Printing byte integer

Printing word integer

Printing float number

Printing double

Addition two integers

Subtracting two integers

Multiplication two integers mul instruction

Multiplication tow integers mult instruction

Reading and Printing an Integer ######### Code segment ###########. text. globl main: # main program entry li $v 0, 5 # Read integer syscall # $v 0 = value read move $a 0, $v 0 li $v 0, 1 syscall # $a 0 = value to print # Print integer li $v 0, 10 syscall # Exit program

Reading and Printing a String ######### Data segment ###########. data str: . space 10 # array of 10 bytes ######### Code segment ###########. text. globl main: # main program entry la $a 0, str # $a 0 = address of str li $a 1, 10 # $a 1 = max string length li $v 0, 8 # read string syscall li $v 0, 4 # Print string str syscall li $v 0, 10 # Exit program syscall

Program 1: Sum of Three Integers # Sum of three integers # # Objective: Computes the sum of three integers. # Input: Requests three numbers. # Output: Outputs the sum. ########## Data segment ##########. data prompt: . asciiz "Please enter three numbers: n" sum_msg: . asciiz "The sum is: " ########## Code segment ##########. text. globl main: la $a 0, prompt # display prompt string li $v 0, 4 syscall li $v 0, 5 # read 1 st integer into $t 0 syscall move $t 0, $v 0

Sum of Three Integers – Slide 2 of 2 li $v 0, 5 syscall move $t 1, $v 0 # read 2 nd integer into $t 1 li $v 0, 5 syscall move $t 2, $v 0 # read 3 rd integer into $t 2 addu # accumulate the sum $t 0, $t 1 $t 0, $t 2 la $a 0, sum_msg li $v 0, 4 syscall # write sum message move $a 0, $t 0 li $v 0, 1 syscall # output sum li $v 0, 10 syscall # exit

Sll muliplication Supported by MARS

Integer division

Branching instruction. data message: . asciiz " the numbers are different" message 1: . asciiz " numbers are equal". text main: addi $t 0, $zero, 61 addi $t 1, $zero , 61 bne $t 0, $t 1, numbersdifferent beq $t 0, $t 1, numbersequal li $v 0, 10 syscall

numbersdifferent: li $v 0, 4 la $a 0, message syscall li $v 0, 10 syscall numbersequal: li $v 0, 4 la $a 0, message 1 syscall li $v 0, 10 syscall

Introduction to function

OUTLINES • If statement • Function pass value • While loop

If statemnt if (($sl > $s 2) || ($s 2 > $s 3)) {$s 4 = 1; }

If statement if (($s 3 <= $s 4) && ($s 4 > $s 5)) { $s 3 = $s 4 + $s 5 }

Function pass value

While loop

Quiz 1 • Write a mips program to solve the following equation by using while loop? • sum= 2+4+6+…+10