mint decadd(n1, n2, sum)
   dec_t *n1;
   dec_t *n2;
   dec_t *sum;

n1

is a pointer to the decimal structure of the first operand.

n2

is a pointer to the decimal structure of the second operand.

sum

is a pointer to a decimal structure to contain the sum (n1 + n2).

The sum value can be the same as the value of either n1 or n2.

0

The operation was successful.

-1200

The operation resulted in overflow.

-1201

The operation resulted in underflow.