prog8/examples/arithmetic/sgn.p8

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%import c64flt
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%import c64textio
%zeropage basicsafe
main {
sub start() {
byte b1
byte b2
ubyte ub1
ubyte ub2
word w1
word w2
uword uw1
uword uw2
float f1
float f2
b1 = 10
b2 = 10
if sgn(b2-b1) != 0
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txt.print("sgn1 error1\n")
b1 = -100
b2 = -100
if sgn(b2-b1) != 0
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txt.print("sgn1 error2\n")
ub1 = 200
ub2 = 200
if sgn(ub2-ub1) != 0
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txt.print("sgn1 error3\n")
w1 = 100
w2 = 100
if sgn(w2-w1) != 0
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txt.print("sgn1 error4\n")
w1 = -2000
w2 = -2000
if sgn(w2-w1) != 0
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txt.print("sgn1 error5\n")
uw1 = 999
uw2 = 999
if sgn(uw2-uw1) != 0
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txt.print("sgn1 error6\n")
f1 = 3.45
f2 = 3.45
if sgn(f2-f1) != 0
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txt.print("sgn1 error7\n")
; -1
b1 = 11
b2 = 10
if sgn(b2-b1) != -1
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txt.print("sgn2 error1\n")
b1 = -10
b2 = -100
if sgn(b2-b1) != -1
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txt.print("sgn2 error2\n")
ub1 = 202
ub2 = 200
if sgn(ub2 as byte - ub1 as byte) != -1
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txt.print("sgn2 error3\n")
w1 = 101
w2 = 100
if sgn(w2-w1) != -1
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txt.print("sgn2 error4\n")
w1 = -200
w2 = -2000
if sgn(w2-w1) != -1
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txt.print("sgn2 error5\n")
uw1 = 2222
uw2 = 999
if sgn((uw2 as word) - (uw1 as word)) != -1
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txt.print("sgn2 error6a\n")
if sgn(uw2 - uw1) != 1 ; always 0 or 1 if unsigned
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txt.print("sgn2 error6b\n")
f1 = 3.45
f2 = 1.11
if sgn(f2-f1) != -1
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txt.print("sgn2 error7\n")
; +1
b1 = 11
b2 = 20
if sgn(b2-b1) != 1
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txt.print("sgn3 error1\n")
b1 = -10
b2 = -1
if sgn(b2-b1) != 1
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txt.print("sgn3 error2\n")
ub1 = 202
ub2 = 205
if sgn(ub2-ub1) != 1
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txt.print("sgn3 error3\n")
w1 = 101
w2 = 200
if sgn(w2-w1) != 1
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txt.print("sgn3 error4\n")
w1 = -200
w2 = -20
if sgn(w2-w1) != 1
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txt.print("sgn3 error5\n")
uw1 = 2222
uw2 = 9999
if sgn(uw2-uw1) != 1
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txt.print("sgn3 error6\n")
f1 = 3.45
f2 = 5.11
if sgn(f2-f1) != 1
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txt.print("sgn3 error7\n")
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txt.print("should see no sgn errors\n")
}
}