48 lines
1.7 KiB
Plaintext
48 lines
1.7 KiB
Plaintext
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\b;Instruction \c;while\n;
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The instruction \c;while () {}\n; is used to repeat a set of instructions several times.
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\b;Basic use
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The most frequent use of \c;while\n; consists in repeating a set of instructions again and again. In order to achieve this, write \c;while (true) {}\n; and put the instructions to be repeated in braces \c;{}\n;. As an example, here is a program that repeats again and again the following actions:
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o look for a spider,
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o turn towards it,
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o shoot.
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\c;
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\s; while (true)
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\s; {
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\s; item = \l;radar\u cbot\radar;(AlienSpider);
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\s; \l;turn\u cbot\turn;(direction(item.position));
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\s; \l;fire\u cbot\fire;(1);
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\s; }
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\n;
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Just execute this program once, and it will kill all spiders around it.
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\b;For specialists
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Syntax :
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\s;\c;while ( condition )
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\s;{
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\s; \n;Instructions ...\c;
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\s;}
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\n;
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This instruction allows you to perform the instructions inside the \l;block\u cbot\bloc; several times.
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Be careful not to confuse the instruction \c;while( ) { }\n; with the instruction \c;\l;do\u cbot\do; { } while( );\n;; the latter tests the condition only after the instructions in the block have been performed a first time.
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\t;\c;condition\n;
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The instructions in the block are performed over and over again, as long as the \l;condition\u cbot\cond; is true.
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Here is an example :
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\s;\c;int i = 0;
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\s;while ( i < 10 )
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\s;{
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\s; \n;Instructions ...\c;
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\s; i = i+1;
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\s;}
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\n;
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\t;Attention
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Do not put a \l;semicolon\u cbot\term; at the end of the line \c;while ( )\n;.
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The instructions \c;\l;break\u cbot\break;\n; and \c;\l;continue\u cbot\continue;\n; can be useful inside a block following the instruction \c;while { }\n;.
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\t;See also
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\l;Instructions\u cbot;, \l;types\u cbot\type; and \l;categories\u cbot\category;.
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