start work on 2_3

src/2_3.asm

@@ -0,0 +1,36 @@
+; 2-3
+
+    option casemap:none
+
+nl      =   10
+maxlen  =   256
+
+    .data
+
+title_str       byte    "listing 2-3", 0
+
+init_prompt     byte    "enter an integer between 0-127: ", 0
+fmt_str1        byte    "the value in hexadecimal: %x", nl, 0
+fmt_str2        byte    "invert all the bits: %x", nl, 0
+fmt_str3        byte    "add 1 (hexadecimal): %x", nl, 0
+fmt_str4        byte    "output as signed int: %d", nl, 0
+fmt_str5        byte    "using the 'neg' instruction: %d", nl, 0
+
+int_value       sqword  ?
+input           byte    maxlen dup (?)
+
+    .code
+
+    externdef   printf:proc
+    externdef   atoi:proc
+    externdef   readline:proc
+
+    public get_title
+get_title PROC
+    lea     rcx, title_str
+    ret
+get_title ENDP
+
+
+
+