undefined variable


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undefined variable

A variable (structure that holds data) that is not available at runtime to the application. This typically occurs with programming languages such as scripts, which allow variables to be located at runtime rather than being resolved ahead of time in a compile stage. See variable.
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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.