To accomplish a distribution of the space, first select one of the still undefined variables
, for example x, then select one of the possible values of this variable, for example n; thus, two new constraints x = n and x [not equal to] n will be available, which together include all the possible solutions.
Before loading your program in the IBM 709, the operating system initialized each word with a branch-and-store instruction to a routine, which printed "What are you doing at xxxx?" Although this was very useful for programs which made ill-advised branches, it did not protect those who computed with undefined variables
. I do not recall its value in integer or floating-point, but Professor B.