Help with simple assembly Program

Hello - I am new to assembly language and just started to learn- I have a question - I have to get input(string, integer and double) from the user and store and print it on screen - but for some reason my code is showing weird o/p - double/string doesn't work.

Could somone guide me please?

#####################################################################
# Test Program:
####################################################################
.data
prompt: .asciiz "\n Please Input an Integer value = "
prompt1: .asciiz "\n Please Input a Double value = "
prompt2: .asciiz "\n Please Input a Float value = "
prompt3: .asciiz "\n Please Input a String value = "
result: .asciiz " The sum of the integers NEW from 1 to N is "
result1: .asciiz " You have enter : "
bye: .asciiz "\n **** Have a good day ****"
.globl main
.text

main:

#Printing a String

li $v0, 4 # system call code for Print String
la $a0, prompt3 # load address of prompt into $a0
syscall # print the prompt message

li $v0, 5 # system call code for Read Integer
syscall # reads the value into $v0

li $v0, 4 # system call code for Print String
la $a0, result1 # load address of message into $a0
syscall # print the string

#lw $a0, $v0
li $v0, 1 # system call code for Print Integer
syscall # print sum of integers

#print a newline
la $a0, newline
li $v0, 4
syscall




#Printing an Integer
li $v0, 4 # system call code for Print String
la $a0, prompt # load address of prompt into $a0
syscall # print the prompt message

li $v0, 5 # system call code for Read Integer
syscall # reads the value into $v0

li $v0, 4 # system call code for Print String
la $a0, result1 # load address of message into $a0
syscall # print the string

#lw $a0, $v0
li $v0, 1 # system call code for Print Integer
syscall # print sum of integers


#print a newline
la $a0, newline
li $v0, 4
syscall




#Printing a double Value

li $v0, 4 # system call code for Print String
la $a0, prompt1 # load address of prompt into $a0
syscall # print the prompt message

li $v0, 5 # system call code for Read Integer
syscall # reads the value into $v0

li $v0, 4 # system call code for Print String
la $a0, result1 # load address of message into $a0
syscall # print the string

#lw $a0, $v0
li $v0, 3 # system call code for Print Double
syscall # print sum of integers

#print a newline
la $a0, newline
li $v0, 4
syscall


end:
li $v0, 4 # system call code for Print String
la $a0, bye # load address of msg. into $a0
syscall # print the string

li $v0, 10 # terminate program run and
syscall # return control to system

 

read and store a string

Code:

.data
S: .space [COLOR=DarkRed]20[/COLOR] #20 characters
...........
    la $a0, S        #store input string into S
    li $a1,[COLOR=DarkRed]20[/COLOR]       
    li $v0,8
    syscall
.............