prog8/examples/comparisons_word.p8

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%import c64utils
%zeropage basicsafe
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main {
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sub start() {
word v1
word v2
ubyte cr
c64scr.print("signed word ")
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cr=v1==v2
cr=v1==v2
cr=v1==v2
cr=v1!=v2
cr=v1!=v2
cr=v1!=v2
cr=v1<v2
cr=v1<v2
cr=v1<v2
cr=v1<v2
cr=v1>v2
cr=v1>v2
cr=v1>v2
cr=v1>v2
cr=v1>v2
cr=v1<=v2
cr=v1<=v2
cr=v1<=v2
cr=v1<=v2
cr=v1>=v2
cr=v1>=v2
cr=v1>=v2
cr=v1>=v2
cr=v1>=v2
; comparisons:
v1=20
v2=$00aa
c64scr.print("v1=20, v2=$00aa\n")
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compare()
v1=20
v2=$7a00
c64scr.print("v1=20, v2=$7a00\n")
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compare()
v1=$7400
v2=$22
c64scr.print("v1=$7400, v2=$22\n")
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compare()
v1=$7400
v2=$2a00
c64scr.print("v1=$7400, v2=$2a00\n")
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compare()
v1=$7433
v2=$2a00
c64scr.print("v1=$7433, v2=$2a00\n")
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compare()
v1=$7433
v2=$2aff
c64scr.print("v1=$7433, v2=$2aff\n")
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compare()
; with negative numbers:
v1=-512
v2=$00aa
c64scr.print("v1=-512, v2=$00aa\n")
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compare()
v1=-512
v2=$7a00
c64scr.print("v1=-512, v2=$7a00\n")
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compare()
v1=$7400
v2=-512
c64scr.print("v1=$7400, v2=-512\n")
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compare()
v1=-20000
v2=-1000
c64scr.print("v1=-20000, v2=-1000\n")
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compare()
v1=-1000
v2=-20000
c64scr.print("v1=-1000, v2=-20000\n")
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compare()
v1=-1
v2=32767
c64scr.print("v1=-1, v2=32767\n")
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compare()
v1=32767
v2=-1
c64scr.print("v1=32767, v2=-1\n")
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compare()
v1=$7abb
v2=$7abb
c64scr.print("v1 = v2 = 7abb\n")
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compare()
v1=$7a00
v2=$7a00
c64scr.print("v1 = v2 = 7a00\n")
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compare()
v1=$aa
v2=$aa
c64scr.print("v1 = v2 = aa\n")
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compare()
check_eval_stack()
return
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sub compare() {
c64scr.print(" == != < > <= >=\n")
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if v1==v2
c64scr.print(" Q ")
else
c64scr.print(" . ")
if v1!=v2
c64scr.print(" Q ")
else
c64scr.print(" . ")
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if v1<v2
c64scr.print(" Q ")
else
c64scr.print(" . ")
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if v1>v2
c64scr.print(" Q ")
else
c64scr.print(" . ")
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if v1<=v2
c64scr.print(" Q ")
else
c64scr.print(" . ")
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if v1>=v2
c64scr.print(" Q ")
else
c64scr.print(" . ")
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c64.CHROUT('\n')
}
}
sub check_eval_stack() {
c64scr.print("stack x=")
c64scr.print_ub(X)
if X==255
c64scr.print(" ok\n")
else
c64scr.print(" error!\n")
}
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}