Final answer:
The student needs to write MIPS assembly code to convert octal numbers to decimal using MARS 4.5. An example code snippet can guide the student through the process, which entails multiplying each octal digit by powers of 8 based on their positions.
Step-by-step explanation:
The student has asked for assistance in writing MIPS assembly language code to convert an octal number to its decimal equivalent using the MARS 4.5 simulator. The code should prompt the user to enter an octal number and then output both the original octal number and the converted decimal number. The process involves reading the octal number as a string, converting it to an integer, and then calculating the decimal value by multiplying each digit by the power of 8 corresponding to its position.
Example Code to Convert Octal to Decimal in MIPS
Below is an example code snippet for the conversion:
.data
prompt: .asciiz "Enter number in octal="
.text
.globl main
main:
li $v0, 4 # syscall for print string
la $a0, prompt # load address of prompt into $a0
syscall # print prompt
#... More code for input and conversion ...#
# Output the result
Conversion Logic Explanation
To perform the conversion, iterate through the characters of the string, convert each character from an octal digit to its integer equivalent, and accumulate the result in a running sum where each digit is multiplied by 8^n (where n is the position of the digit from right to left, starting at 0).