Conditional

``If'' statements are also done by using JMP instructions. Multiple conditions can be tested by using several JMP instructions. Here are some examples of how to do ``if'' statements:

Pascal:

IF (x = 10)
THEN
BEGIN
... (* then part 1 *)
END
ELSE
BEGIN
... (* else part 1 *)
END;

IF ((x<>10) AND (y>20))
THEN
BEGIN
... (* then part 2 *)
END;
C++:

if (x == 10) {
... // then part 1
}
else {
... // else part 1
}

if ((x!=10) && (y>20)) {
... // then part 2
}
Assembly:

LOAD r1, X ; load the variable x into r1
SET r2, 10 ; set r2 to immediate value 10
CMP r1, r2
JMP NEQ, ELSE1 ; if r1 <> r2, then jump to the else part, otherwise do the then part
... ; then part 1
JUMP END1 ; jump over the else part
ELSE1:
... ; else part 1
END1:

LOAD r1, X ; load the variable x into r1
SET r2, 10 ; set r2 to immediate value 10
CMP r1, r2
JMP NEQ, TEST2 ; if x <> 10 go on to next test
JUMP END2 ; otherwise skip past then part 2
TEST2:
LOAD r1, Y ; load the variable y into r1
SET r2, 20 ; set r2 to immediate value 20
CMP r1, r2
JMP GT, THEN2 ; if y > 20 go on to then part 2
JUMP END2 ; otherwise skip past
THEN2:
... ; then part 2
END2: