Write a MIPS assembly language program that prompts for a user to enter a series
ID: 3766115 • Letter: W
Question
Write a MIPS assembly language program that prompts for a user to enter a series of floating point numbers and calls read_float to read in numbers and store them in an array only if the same number is not stored in the array yet. Then the program should display the array content on the console window.
Consult the green sheet and the chapter 3 for assembly instructions for floating point numbers. Here is one instruction that you might use:
c.eq.s $f2, $f4
bc1t Label1
Here if the value in the register $f2 is equals to the value in $f4, it jumps to the Label1. If it should jump when the value in the register $f2 is NOT equals to the value in $f4, then it should be:
c.eq.s $f2, $f4
bc1f Label1
To load a single precision floating point number (instead of lw for an integer), you might use:
l.s $f12, 0($t0)
To store a single precision floating point number (instead of sw for an integer), you might use:
s.s $f12, 0($t0)
To assign a constant floating point number (instead of li for an integer), you might use:
li.s $f12, 123.45
To copy a floating point number from one register to another (instead of move for an integer), you might use:
mov.s $f10, $f12
The following shows the syscall numbers needed for this assignment.
System Call System Call System Call
Number Operation Description
2 print_float $v0 = 2, $f12 = float number to be printed
4 print_string $v0 = 4, $a0 = address of beginning of ASCIIZ string
6 read_float $v0 = 6; user types a float number at keyboard; value is store in $f0
8 read_string $v0 = 8; user types string at keybd; addr of beginning of string is store in $a0; len in $a1
Here are sample outputs (user input is in bold): -- note that you might get some rounding errors
Enter a number:
3
Enter a number:
54.4
Enter a number:
2
Enter a number:
5
Enter a number:
2
Enter a number:
-4
Enter a number:
5
Enter a number:
76
Enter a number:
-23
Enter a number:
43.53
Enter a number:
-43.53
Enter a number:
43.53
Enter a number:
65.43
The array contains the following:
3.00000000
54.40000153
2.00000000
5.00000000
-4.00000000
76.00000000
-23.00000000
43.52999878
-43.52999878
65.43000031
Explanation / Answer
Given below is the MIPS code for the question . Output also shown. Please don't forget to rate the answer if it helped. Thank you.
.data
arraysize: .word 10
array: .float 0.0:10
prompt1: .asciiz "Enter a number: "
msg1: .asciiz "The array contains the following: "
newline: .asciiz " "
.text
#store size of array in t0
lw $t0, arraysize
la $t1, 0 #offset
li $t2, 0 #index
loop1:
bge $t2, $t0, loop1_end #reached end of array
#prompt the user
la $a0, prompt1
li $v0, 4
syscall
#read the float number
li $v0, 6
syscall
mov.s $f1, $f0
li $t3, 0 #offset
li $t4, 0 #alreadystored = 0
loop2:
bge $t3, $t1, loop2_end
l.s $f2, array($t3)
c.eq.s $f1 $f2
bc1f loop2_next
li $t4, 1
loop2_next:
addi $t3, $t3, 4
b loop2
loop2_end:
beq $t4, 1, loop1 #already in array
s.s $f1, array($t1)
addi $t1, $t1, 4 #increment offset
addi $t2, $t2, 1 #increment index
b loop1
loop1_end:
#print the array
la $a0, msg1
li $v0, 4
syscall
li $t1, 0 #offset is 0
li, $t2, 0 #index
loop3:
bge $t2, $t0, loop3_end
l.s $f12, array($t1)
li $v0, 2
syscall
la $a0, newline
li $v0, 4
syscall
addi $t2, $t2, 1 #increment index
addi $t1, $t1, 4 #increment offset
b loop3
loop3_end:
#exit
li $v0, 10
syscall
output
Enter a number: 3
Enter a number: 54.4
Enter a number: 2
Enter a number: 5
Enter a number: 2
Enter a number: -4
Enter a number: 5
Enter a number: 76
Enter a number: -23
Enter a number: 43.53
Enter a number: -43.53
Enter a number: 43.53
Enter a number: 65.43
The array contains the following:
3.0
54.4
2.0
5.0
-4.0
76.0
-23.0
43.53
-43.53
65.43
-- program is finished running --
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