forked from rosh/MQL5Book
52 lines
2 KiB
MQL5
52 lines
2 KiB
MQL5
 | //+------------------------------------------------------------------+
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//| ExprConditional.mq5 |
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//| Copyright 2021, MetaQuotes Ltd. |
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//| https://www.mql5.com |
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//+------------------------------------------------------------------+
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#property copyright "Copyright 2021, MetaQuotes Ltd."
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#property link "https://www.mql5.com"
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#property version "1.00"
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#define PRT(A) Print(#A, "=", (A))
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//+------------------------------------------------------------------+
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//| Script program start function |
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//+------------------------------------------------------------------+
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void OnStart()
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{
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bool A = false, B = false, C = true;
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int x = 1, y = 2, z = 3, p = 4, q = 5, f = 6, h = 7;
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int r0 = x > y ? z : p != 0 && q != 0 ? f / (p + q) : h; // 0
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int r1 = A ? x : C ? p : q; // 4
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int r2 = A ? B ? x : y : z; // 3
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int r3 = A ? B ? C ? p : q : y : z; // 3
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int r4 = A ? B ? x : y : C ? p : q; // 4
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int r5 = A ? f : h ? B ? x : y : C ? p : q; // 2
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// errors:
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// ';' - unexpected token
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// ';' - ':' colon sign expected
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// int r6 = A ? B ? x : y; // one of conditions is incomplete
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PRT(x > y ? z : p != 0 && q != 0 ? f / (p + q) : h);
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PRT(A ? x : C ? p : q);
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PRT(A ? B ? x : y : z);
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PRT(A ? B ? C ? p : q : y : z);
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PRT(A ? B ? x : y : C ? p : q);
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PRT(A ? f : h ? B ? x : y : C ? p : q);
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// warning: expression not boolean
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// treated as: A ? f : ((h + B) ? x : y),
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// where (h + B) goes for boolean
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int w = A ? f : h + B ? x : y; // 1
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// ok: explicit parentheses
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int v = (A ? f : h) + (B ? x : y); // 9
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PRT(A ? f : h + B ? x : y);
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PRT((A ? f : h) + (B ? x : y));
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}
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//+------------------------------------------------------------------+
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