Special variables: Difference between revisions
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=={{header|ALGOL W}}== |
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<lang algolw>% the Algol W standard environment includes the following standard variables: % |
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integer I_W % field width for integer output % |
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integer R_W % field width for real output % |
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integer R_D % number of decimal places for real output % |
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string(1) R_FORMAT % format for real output: |
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S - "scaled" normalised mantissa with exponent |
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A - "aligned" fixed point format |
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F - "free" either scaled or aligned as appropriate |
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for the value and field width |
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% |
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integer S_W % separator width - number of spaces following non-string output items % |
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integer MAXINTEGER % largest integer value % |
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real EPSILON % largest positive real number such that 1 + epsilon = 1 % |
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long real LONGEPSILON % largest positive long real number such that 1 + longepsilon = 1 % |
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long real MAXREAL % largest real number % |
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long real PI % approximation to pi % |
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% the following reference(EXCEPTION) variables control how errors are handled: |
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ENDFILE - end-of-file |
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OVFL - overflow |
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UNFL - underflow |
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DIVZERO - division by zero |
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INTOVFL - integer overflow |
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INTDIVZERO - integer division by zero or modulo 0 |
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SQRTERR - invalid SQRT parameter |
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EXPERR - invalid EXP parameter |
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LNLOGERR - invalid LN or LOG parameter |
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SINCOSERR - invalid SIN or COS parameter |
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The EXCEPTION record is defined as follows: |
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record EXCEPTION( logical XCPNOTED - true if the exception has occurred |
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; integer XCPLIMIT - number of times the exception can occur |
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before the program terminates |
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, XCPACTION - if the program continues, controls how to |
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replace the erroneous value |
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; logical XCPMARK - true if an error message should be printed |
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even if the program continues |
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; string(64) XCPMSG - message to describe the exception |
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) |
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if the relevant EXCEPTION variable is null, the exception is ignored, |
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otherwise it is processed according to the settings of XCPLIMIT etc. |
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%</lang> |
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=={{header|AWK}}== |
=={{header|AWK}}== |