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LINE INPUT will now use the faster method if passed a file handle that has been opened FOR BINARY. As such, the _BLINEINPUT command has been removed. qb64.bas now takes advantage of this for reading from '$include files, at least in Include Manager 1. Some tweaking of internal/source/main.txt was required to get things into a sane state, so I'm holing off changing the compiler any further so the auto-builder can make sure everything's smoothed over. Note: Everything should still compile as normal; I'm just being overcautious.
38 lines
1.3 KiB
Plaintext
38 lines
1.3 KiB
Plaintext
The {{KW|ATN}} or arctangent function returns the angle in radians of a numerical [[TAN|tangent]] value.
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{{PageSyntax}}
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:: radian_angle = '''ATN(''tangent!'')'''
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{{PageDescription}}
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* The [[SINGLE]] or [[DOUBLE]] ''tangent'' value would be equal to the tangent value of an angle. EX: [[TAN]](ATN(1)) = 1
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* The return is that tangent value's ''angle'' in radians. To convert from radians to degrees, multiply radians * (180 / π).
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* The function return value is between -π / 2 and π / 2.
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''Example 1:'' When the [[TAN]]gent value equals 1, the line is drawn at a 45 degree angle(.7853982 radians) where [[SIN]] / [[COS]] = 1.
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{{CodeStart}} '' ''
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{{Cl|SCREEN}} 12
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x = 100 * {{Cl|COS}}({{Cl|ATN}}(1))
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y = 100 * {{Cl|SIN}}({{Cl|ATN}}(1))
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{{Cl|LINE}} (200, 200)-(200 + x, 200 + y) '' ''
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{{CodeEnd}}
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''Example 2:'' {{KW|ATN}} can be used to define π in [[SINGLE]] or [[DOUBLE]] precision. The calculation can NOT be used as a [[CONST]]ant.
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{{CodeStart}} '' ''
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Pi = 4 * {{Cl|ATN}}(1) '{{Cl|SINGLE}} precision
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Pi# = 4 * {{Cl|ATN}}(1#) '{{Cl|DOUBLE}} precision
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PRINT Pi, Pi# '' ''
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{{CodeEnd}}
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{{PageSeeAlso}}
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* [[TAN]] {{text|(tangent)}}
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* [[SIN]], [[COS]]
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* [[Mathematical Operations]]
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* [[Mathematical_Operations#Derived_Mathematical_Functions|Derived Mathematical Functions]]
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{{PageNavigation}} |