; exnl3.asm  example  declare variables, arrays, matrix
	extern printf
        section .data		; Data section, initialized variables
msg:	db "nasm  exnl3.asm running", 0	; C string needs 0
msg2:	db "exnl3.asm finished", 0	
fmt:    db "%s", 10, 0
i1:	db 1			; byte, 8 bit, integer 1
i2:	dw 2			; word, 16 bit, integer 2
j3:	dd 3, 3.5		; double word, 32 bit, integer 3, float 3.5
f4:	dq 1.1, 1.2, 2.1, 2.2   ; quad word, 64 bit, double 1.1, 1.2, 2.1, 2.2
i3:	dq 1, 2, 3              ; quad word, 64 bit, long integers 1, 2, 3
				; quad word is 8 bytes (for indexing address)
	
	section .rodata		; read only data, protected
one:	dq 1.0 			; can not be changed
	
	section .bss		; block starting symbol for arrays
s1:	resb 80			; 80 characters, bytes, allocated
b2:	resw 2			; 2 words allocated
c5:	resd 5			; 5 double words allocated
a1:	resq 3			; 3 quad words allocated
m1:	resq 4			; 4 quad words, could be 2 by 2 integer matrix
	                        ; increment byte address by 4 for each integer
dmat:	resq 8			; could be 2 by 2 matrix of double
				; increment byte address by 8 for each double
	
        section .text           ; Code section.
        global main		; main program required name  "main"
main:
        push    rbp		; set up stack frame, must be aligned
	
	mov	rdi,fmt         ; address of format, required register rdi
	mov	rsi,msg         ; address of data
	mov	rax,0		; or can be  xor  rax,rax
        call    printf		; Call C function


	
	mov	rdi,fmt		; finished print statement
	mov	rsi,msg2
	mov	rax,0
	call	printf
        pop     rbp		; restore stack 
	mov	rax,0		; normal, no error, return value
	ret			; return