Abstract.Charles T. Zahn has recently proposed a new and promising statement that encourages structured thinking and that may also be said to make programming become documentation. D. E. Knuth has suggested that this statement may be of importance in future languages, and it has been thoroughly discussed in the literature. However, it seems that the statement is not properly suited for problems requiring nested constructs, and it is argued that this is caused by the long implicit jumps in the statement. It is also shown that by introducing an eventvariable and by permitting different events to share actions, the statement will become even more useful. A modified statement is proposed and demonstrated on a number of standard ill-structured algorithms that normally call for the use of GOTOs.
Absrracr-A distributed control system for a set of earth stations sharing satellite communication channels is studied. The stations communicate by messages which may be corrupted by errors. A suffkient set of message types are defined to allow stations to enter and leave the system, to arbitrate for communication channels, and to recover from error situations. The error.piocesses assumed are of a transient nature, mainly existing on the interstation control channels. The signaling communication protocols are informally described in a Pascal-like language. The protocols are simulated in Simula and are found to work correctly in all cases studied.
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