; ifint.asm  code ifint.c for nasm 
; /* ifint.c an 'if' statement that will be coded for nasm */
; #include <stdio.h>
; int main()
; {
;   int a=1;
;   int b=2;
;   int c=3;
;   if(a<b)
;     printf("true a < b \n");
;   else
;     printf("wrong on a < b \n");
;   if(b>c)
;     printf("wrong on b > c \n");
;   else
;     printf("false b > c \n");
;   return 0;
;}
; result of executing both "C" and assembly is:
; true a < b
; false b > c 
	
	global	main		; define for linker
        extern	printf		; tell linker we need this C function
        section .data		; Data section, initialized variables
a:	dd 1
b:	dd 2
c:	dd 3
fmt1:   db "true a < b ",10,0
fmt2:   db "wrong on a < b ",10,0
fmt3:   db "wrong on b > c ",10,0
fmt4:   db "false b > c ",10,0

	section .text
main:	mov	eax,[a]
	cmp	eax,[b]
	jge	false1		; choose jump to false part
	; a < b sign is set
        push    dword fmt1	; printf("true a < b \n"); 
        call    printf	
        add     esp,4
        jmp	exit1		; jump over false part
false1:	;  a < b is false 
        push    dword fmt2	; printf("wrong on a < b \n");
        call    printf
        add     esp,4
exit1:				; finished 'if' statement

	mov	eax,[b]
	cmp	eax,[c]
	jle	false2		; choose jump to false part
	; b > c sign is not set
        push    dword fmt3	; printf("wrong on b > c \n");
        call    printf	
        add     esp,4
        jmp	exit2		; jump over false part
false2:	;  a < b is false 
        push    dword fmt4	; printf("false b > c \n");
        call    printf
        add     esp,4
exit2:				; finished 'if' statement

	mov	eax,0		; normal, no error, return value
	ret			; return 0;