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Annotation of 43BSD/contrib/icon/operators/mod.c, revision 1.1.1.1

1.1       root        1: #include "../h/rt.h"
                      2: 
                      3: /*
                      4:  * x % y - take remainder of x / y.
                      5:  */
                      6: 
                      7: mod(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.  If y is 0, generate an error because
                     26:        *  it's divide by 0.  Otherwise, just return the modulus of the
                     27:        *  two arguments.
                     28:        */
                     29:       if (n2.integer == 0L)
                     30:          runerr(202, &arg2);
                     31:       mkint(n1.integer % n2.integer, &arg0);
                     32:       }
                     33:    else {
                     34:       /*
                     35:        * Either x or y is real, convert the other to a real, perform
                     36:        *  the modulation, convert the result to an integer and place it
                     37:        *  in arg0 as the return value.
                     38:        */
                     39:       if (t1 == T_LONGINT)
                     40:          n1.real = n1.integer;
                     41:       if (t2 == T_LONGINT)
                     42:          n2.real = n2.integer;
                     43:       mkreal(n1.real - n2.real * (int)(n1.real / n2.real), &arg0);
                     44:       }
                     45:    ClearBound;
                     46:    }
                     47: 
                     48: Opblock(mod,2,"%")

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