compute

Contents

• Name
• Syntax
• Description
• Diagnostics
• Return value
• Author
• Examples
• Id

Name

Syntax

 #include <xite/compu4.h>

 int compute_line( char* inp_line,  ...);

 number *compute_answer( void  );

 char *compute_error( int message );

 int compute_define( char* name, func action );

Description

 #define TY_UN -1  * Unknown, Error  in i_value  *
 #define TY_BF 0   * Boolean, false
 #define TY_BT 1   * Boolean, true
 #define TY_CI 2   * int,     Answer in i_value  *
 #define TY_CD 3   * double,  Answer in d_value  *
 #define TY_CS 4   * *char,   Answer in p_value  *
 #define TY_BO 5   * Boolean, Answer in i_value  *
 #define TY_CP 6   * Predefined constant         *
 #define TY_VR 7   * Variable                    *

 typedef struct u_tag
 {
   union
   {
     INT i_value;
     double d_value;
     char *p_value
   } u_value
   int u_type;
 } number;

 S -> $
 S -> E$
 E -> un E
 E -> E op E
 E -> (E)
 E -> id = E

 $ -  End of line
 E -  Input constant.
        %S - The first argument in the list is
             replaced as a character string.
        %s - The next (or second) argument in the list is
             replaced as a character str ing.
        %L - The first argument in the list is
             replaced as a lowercase character string.
        %l - The next (or second) argument in the list is
             replaced as a lowercase character string.
        %U - The first argument in the list is
             replaced as a uppercase character string.
        %u - The next (or second) argument in the list is
             replaced as a uppercase character string.
        %D - The first argument in the list is
             replaced as an integer.
        %d - The next (or second) argument in the list is
             replaced as an integer.
        %F - The first argument in the list is
             replaced as a double precision.
        %f - The next (or second) argument in the list is
             replaced as a double precision.
      Predefined Constant.
        INT    - All integer strings and all integers
        REAL   - All floating-point strings and reals
        FILE   - All strings = name of existing file.
        EXE    - All strings = name of executable file.
        WRITE  - All strings = name of file with write
                 access.
        READ   - All strings = name of file with read
                 access.
        usrdef - Define your own constant
      Result from: un E, E op E, or (E)
 un - [+,-]     int, float or string,
                String is converted to INT or float.
      [NOT]     Boolean
 op - [*,/]     int, float or string.
                String is converted to INT or float.
                INT op float -> int.
                float op INT -> float.
 op - [+,-]     int, float or string.
                String is converted to INT or float.
                 INT op float -> int.
                float op INT -> float.
 op - [LT,<,LE,<=,EQ,==,NE,!=,GE,>=,GT,>]
                String is converted to INT or float.
                INT op float -> INT   op INT   -> Boolean.
                float op INT -> float op float -> Boolean.
 op   [IS]      True is first argument match the regular
                expresion in arg2. All Predefined
                constants are valid regular expresions.
 op - [AND]     Bool op Bool -> Bool. Second argument
                is not computed if first arg is FALSE.
 op - [OR]      Bool op Bool -> Bool. Second argument
                is not computed if first arg is TRUE.
 () -           Operators abow are listed with decreasing
                precedence.
 =              Define variables. Defined variables may
                be used in other expressions.
                A = 4
                B = 2*A

Diagnostics

Return value

 E_TOK - Undefined token.
 E_ARG - Missing argument.
 E_OP  - Missing operand.
 E_LP  - Too many )'s.
 E_EOL - Unexpected end of line.
 E_RP  - Expected )
 E_TYP - Wrong arg type for op
 E_LEN - Too long input line
 E_EQ  - Variable expexted

Author

Examples

Id