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Annotation of 43BSD/contrib/icon/operators/mult.c, revision 1.1

1.1     ! root        1: #include "../h/rt.h"
        !             2: 
        !             3: /*
        !             4:  * x * y - multiply x and y.
        !             5:  */
        !             6: 
        !             7: mult(nargs, arg2, arg1, arg0)
        !             8: int nargs;
        !             9: struct descrip arg2, arg1, arg0;
        !            10:    {
        !            11:    register int t1, t2;
        !            12:    union numeric n1, n2;
        !            13: 
        !            14:    SetBound;
        !            15:    /*
        !            16:     * x and y must be numeric.  Save the cvnum return values for later use.
        !            17:     */
        !            18:    if ((t1 = cvnum(&arg1, &n1)) == NULL)
        !            19:       runerr(102, &arg1);
        !            20:    if ((t2 = cvnum(&arg2, &n2)) == NULL)
        !            21:       runerr(102, &arg2);
        !            22: 
        !            23:    if (t1 == T_LONGINT && t2 == T_LONGINT)
        !            24:       /*
        !            25:        * Both x and y are integers.  Perform the multiplication and
        !            26:        *  and place the result in arg0 as the return value.
        !            27:        */
        !            28:       mkint(n1.integer * n2.integer, &arg0);
        !            29:    else {
        !            30:       /*
        !            31:        * Either x or y is real, convert the other to a real, perform
        !            32:        *  the subtraction and place the result in arg0 as the return value.
        !            33:        */
        !            34:       if (t1 == T_LONGINT)
        !            35:          n1.real = n1.integer;
        !            36:       if (t2 == T_LONGINT)
        !            37:          n2.real = n2.integer;
        !            38:       mkreal(n1.real * n2.real, &arg0);
        !            39:       }
        !            40:    ClearBound;
        !            41:    }
        !            42: 
        !            43: Opblock(mult,2,"*")

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