School Commit Init

Anul 1/Semestrul 1/ASC/Homework 8/Function calls/16/16.asm

@@ -0,0 +1,47 @@
+bits 32 ; assembling for the 32 bits architecture
+
+; declare the EntryPoint (a label defining the very first instruction of the program)
+global start        
+
+; declare external functions needed by our program
+extern exit,scanf,printf               ; tell nasm that exit exists even if we won't be defining it
+import exit msvcrt.dll    ; exit is a function that ends the calling process. It is defined in msvcrt.dll
+import scanf msvcrt.dll
+import printf msvcrt.dll
+
+; our data is declared here (the variables needed by our program)
+
+;Read two numbers a and b (in base 10) from the keyboard. Calculate and print their arithmetic average in base 16
+
+segment data use32 class=data
+    read_query db "%d",0
+    write_query db "The arithmetic average in base 16 is: 0x%08X",0
+    a dd 0
+    b dd 0
+    
+; our code starts here
+segment code use32 class=code
+    start:
+        ; ...
+        push dword a
+        push dword read_query
+        call [scanf]
+        add ESP,4*2
+        
+        push dword b
+        push dword read_query
+        call [scanf]
+        add ESP,4*2
+        
+        mov EAX,[a]
+        add EAX,[b]
+        sar EAX,1
+        
+        push EAX
+        push write_query
+        call [printf]
+        add ESP, 4*2
+        
+        ; exit(0)
+        push    dword 0      ; push the parameter for exit onto the stack
+        call    [exit]       ; call exit to terminate the program