School Commit Init

Anul 1/Semestrul 1/ASC/Seminar 5/1.asm

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+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,printf,scanf               ; 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
+                          ; msvcrt.dll contains exit, printf and all the other important C-runtime specific functions
+import printf msvcrt.dll  ; printf is a function that prints a string to the standard output. It is defined in msvcrt.dll
+import scanf msvcrt.dll   ; scanf is a function that reads a string from the standard input. It is defined in msvcrt.dll
+
+; our data is declared here (the variables needed by our program)
+segment data use32 class=data
+    ; ...
+    message db "n=",0
+    n dd 0
+    read db "%d",0
+
+; our code starts here
+segment code use32 class=code
+    start:
+        ; ...
+        ;Write a programs that prints the message "n=" on the screen and then read from keyword the value for the signed number n
+        push dword message
+        call [printf]
+        add ESI,4*1
+        push dword n
+        push dword read
+        call [scanf]
+        add ESI,4*2
+        
+        ; exit(0)
+        push    dword 0      ; push the parameter for exit onto the stack
+        call    [exit]       ; call exit to terminate the program