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

1.1     ! root        1: #include "../h/rt.h"
        !             2: 
        !             3: /*
        !             4:  * x + y - add x and y.
        !             5:  */
        !             6: 
        !             7: plus(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:    extern long ckadd();
        !            14: 
        !            15:    SetBound;
        !            16:    /*
        !            17:     * x and y must be numeric.  Save the cvnum return values for later use.
        !            18:     */
        !            19:    if ((t1 = cvnum(&arg1, &n1)) == NULL)
        !            20:       runerr(102, &arg1);
        !            21:    if ((t2 = cvnum(&arg2, &n2)) == NULL)
        !            22:       runerr(102, &arg2);
        !            23: 
        !            24:    if (t1 == T_LONGINT && t2 == T_LONGINT)
        !            25:       /*
        !            26:        * Both x and y are integers.  Perform integer addition using
        !            27:        *  ckadd (to check for overflow) and place the result in arg0 as
        !            28:        *  the return value.
        !            29:        */
        !            30:       mkint(ckadd(n1.integer, n2.integer), &arg0);
        !            31:    else {
        !            32:       /*
        !            33:        * Either x or y is real, convert the other to a real, perform
        !            34:        *  the addition and place the result in arg0 as the return value.
        !            35:        */
        !            36:       if (t1 == T_LONGINT)
        !            37:          n1.real = n1.integer;
        !            38:       if (t2 == T_LONGINT)
        !            39:          n2.real = n2.integer;
        !            40:       mkreal(n1.real + n2.real, &arg0);
        !            41:       }
        !            42:    ClearBound;
        !            43:    }
        !            44: 
        !            45: Opblock(plus,2,"+")

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