fun_console_hex.asm

#--------
read_number: #int read_number ()
		#writes a number from the console to the a0 register
		addi 	sp, sp, -12
		sw	ra, 0(sp)
		sw	s0, 4(sp)
		sw	s1, 8(sp)
		
		li 	s0, 0
		li 	s1, 8
while_rn:	readch
		li 	t0, 10
		beq 	a0, t0, end_rn
		beqz	s1, error_rn_1
cap_char_rn:	li	a1, 0x61
		li 	a2, 0x66
		li 	a3, -0x57
		blt 	a0, a1, not_cap_char_rn
		j	general_rn
not_cap_char_rn:li 	a1, 0x41
		li 	a2, 0x46
		li 	a3, -0x37
	 	blt 	a0, a1 not_sm_char_rn
	 	j 	general_rn
not_sm_char_rn: li 	a1, 0x30
		li 	a2, 0x39
		li 	a3, -0x30
general_rn:	call	convert_number
		slli	s0, s0, 4
		add	s0, s0, a0
		addi	s1, s1, -1
		j 	while_rn	
		
end_rn:		mv	a0, s0
		lw	ra, 0(sp)
		lw	s0, 4(sp)
		lw	s1, 8(sp)
		addi	sp, sp, 12
 		ret
error_rn_1: error "\nERROR: variable overflow", a0
#--------
print_number:#void print_number (int a0)
		#outputs the number in a0 to the console
		addi 	sp, sp, -12
		sw	ra, 0(sp)
		sw	s0, 4(sp)
		sw	s1, 8(sp)
		
		mv 	s0, a0
		li 	s1, 32
do_while_pn:	beqz	s1, end_pn	
		addi	s1,s1,-4 
		srl 	a0, s0,s1
		andi 	a0, a0, 15
		li 	a1, 0
		li 	a2, 9
		li 	a3, 0x30
		ble	a0, a2 general_pn 
		li 	a1, 10
		li 	a2, 15
		li 	a3, 0x37
general_pn:	call 	convert_number
		printch a0
		j 	do_while_pn
		
end_pn:		lw	ra, 0(sp)
		lw	s0, 4(sp)
		lw	s1, 8(sp)
		addi	sp, sp, 12
		ret