Adding two numbers in GAS - math

Question

I'm new to GAS assembly here, my goal is to display the sum of the added two numbers that were entered by the user. I used char to number conversion and vice-versa and the results is always wrong (non-numeric). Can somebody tell me where's the mistake? Thanks in advance.
.section .data
prompt_str1:
.ascii "Enter first number: "
str1_end:
.set STR1_SIZE, str1_end-prompt_str1
prompt_str2:
.ascii "Enter second number: "
str2_end:
.set STR2_SIZE, str2_end-prompt_str2
.section .bss
.lcomm input1 2
.lcomm input2 2
.lcomm ans 1
.macro write str,str_size
movl $4, %eax
movl $1, %ebx
movl \str, %ecx
movl \str_size, %edx
int $0x80
.endm
.macro writenum str
movl $4, %eax
movl $1, %ebx
movl \str, %ecx
int $0x80
.endm
.macro read buff, buff_size
movl $3, %eax
movl $0, %ebx
movl \buff, %ecx
movl \buff_size, %edx
int $0x80
.endm
.section .text
.globl _start
_start:
write $prompt_str1, $STR1_SIZE
read $input1, $2
write $prompt_str2, $STR2_SIZE
read $input2, $2
subl $0x30, input1
subl $0x30, input2
movl $input1, %eax
addl $input2, %eax
movl %eax, ans
addl $0x30, ans
writenum $ans
exit:
movl $1, %eax
movl $0, %ebx
int $0x80

Answer 1

movl $input1, %eax
addl $input2, %eax
You're moving the address of input1 into %eax and adding the address of input2. Lose the $!
There's probably more wrong with this code. Since you're only able to handle single digits (including sum!), you should probably be using bytes here, not "longs", but just dumping the $ gets you a numeric result at least.
This distinction between an address and "contents at that address" is a really important one! Unfortunately, every assembler does it differently... sigh...