I was watching your videos on youtube about assembly, but I have many doubts… I have an exercise to do until next Sunday, and I don’t know how to do it!
The steps are:A) Send the message: “Enter your registration number”;
B) Receive 9 numeric digits corresponding to a registration number;
C) If the registration is all zero, and the program (call the system with the exit operation)
D) Search in the registrations stored as constants in the program
D.1) If you find the registration, present the text:
“The registration number XXXXXXXXX corresponds to student YYYYYYYY.”
D.2) If you can not find the registration, please submit the text:
“Registration XXXXXXXXX was not found”
D.3) If the registration number corresponds to your registration number, present the text:
“It’s me! I’M YYYYY YYYYY YYYY and my register number is XXXXXXXXX ”
E) Go back to step “A”The names must be stored using .asciiz and the registration numbers must be stored as a 32-bit integer, formatted as BCD, that is, every 4 bits, we have a decimal digit. The first number of the register number is always 1 and should not be stored. Registration example: 112345678 will be stored in hexadecimal as
12345678h (binary 0001_0010_0011_0100_0101_0110_0111_1000);
See below:
# Partially completed solution.
.data
message: .asciiz "Enter your registration number: "
found_message: .asciiz "The registration number XXXXXXXXX corresponds to student YYYYYYYY.\n"
not_found_message: .asciiz "Registration XXXXXXXXX was not found.\n"
my_number_found_message: .asciiz "It's me! I'M YYYYY YYYYY YYYY, and my register number is XXXXXXXXX.\n"
registration_names: .asciiz "XXXXXX", "YYYYYY"
registration_numbers: .word 0x0000000, 0x000000
my_number: .word 0x000000
.eqv ARRAY_SIZE 8 # 2 ints = 8 bytes
.text
main:
loop:
# Show prompt.
li $v0, 4
la $a0, message
syscall
# Get input.
li $v0, 5
syscall
# If all 0's, then end program.
move $a0, $v0
beqz $a0, main_exit
# Search (pass value to search in $a1).
move $a1, $a0
jal search_registration
b loop
main_exit:
li $v0, 10
syscall
# Expects user input in $a1.
search_registration:
# $t1 is loop index. $t2 is my number.
li $t1, 0
search_loop:
lw $a0, registration_numbers($t1)
beq, $a0, $a1, number_found
addi $t1, $t1, 4
beq $t1, ARRAY_SIZE, number_not_found
blt $t1, ARRAY_SIZE, search_loop
number_found:
lw $t2, my_number
beq $a0, $t2, my_number_found
li $v0, 4
la $a0, found_message
syscall
b search_registration_exit
my_number_found:
li $v0, 4
la $a0, my_number_found_message
syscall
b search_registration_exit
number_not_found:
li $v0, 4
la $a0, not_found_message
syscall
search_registration_exit:
jr $ra
