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progs/fib.while
author Christian Urban <christian dot urban at kcl dot ac dot uk>
Sun, 03 Nov 2013 00:41:24 +0000
changeset 178 d36363d648e3
parent 147 4725bba8ef26
child 182 9ce2414e470e
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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/* Fibonnacci sequence implemented in
Christian Urban <christian dot urban at kcl dot ac dot uk>
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   the WHILE language */
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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write "Input a number ";
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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read n;
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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x := 0;   // start values
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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y := 1;
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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while n > 0 do {
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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  temp := y;
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  y := x + y;
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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  x := temp;
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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  n := n - 1  // decrement counter
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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};
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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write "Result ";
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write y
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Christian Urban <christian dot urban at kcl dot ac dot uk>
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