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Annotation of 43BSD/contrib/icon/functions/abs.c, revision 1.1

1.1     ! root        1: #include "../h/rt.h"
        !             2: 
        !             3: /*
        !             4:  * abs(x) - absolute value of x.
        !             5:  */
        !             6: Xabs(nargs, arg1, arg0)
        !             7: int nargs;
        !             8: struct descrip arg1, arg0;
        !             9:    {
        !            10:    union numeric result;
        !            11: 
        !            12:    switch (cvnum(&arg1, &result)) {
        !            13:       /*
        !            14:        * If x is convertible to a numeric, turn arg0 into
        !            15:        *  a descriptor for the appropriate type and value.  If the
        !            16:        *  conversion fails, produce an error.  This code assumes that
        !            17:        *  x = -x is always valid, but this assumption does not always
        !            18:        *  hold.
        !            19:        */
        !            20:       case T_LONGINT:
        !            21:          if (result.integer < 0L)
        !            22:             result.integer = -result.integer;
        !            23:          mkint(result.integer, &arg0);
        !            24:          break;
        !            25: 
        !            26:       case T_REAL:
        !            27:          if (result.real < 0.0)
        !            28:             result.real = -result.real;
        !            29:          mkreal(result.real, &arg0);
        !            30:          break;
        !            31: 
        !            32:       default:
        !            33:          runerr(102, &arg1);
        !            34:       }
        !            35:    }
        !            36: 
        !            37: Procblock(abs,1)

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