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Cesil

Cesil, or Computer Education in Schools Instruction Language, was a programming language designed to introduce pupils in British schools to Assembly language. It is rather difficult to define it as high or low level. It has a total of fourteen instructions:

  • Load value - place the immediate value or the contents of the variable named in the accumulator.
  • Store variable - place the contents of the accumulator in the variable.
  • Jump label - transfer control to location labelled.
  • Jineg label - transfer control to location labelled if the accumulator contains a negative value.
  • Jizero label - transfer control to location labelled if the accumulator contains zero.
  • Print literal - output the following string, delimited by single quotes.
  • Line - output a carriage return
  • In - allow user to input a numerical value from the console.
  • Out - Output the contents of the accumulator as a decimal integer, signed if negative.
  • Add value - add the variable or immediate integer value to the accumulator.
  • Subtract value - subtract the variable or immediate integer from the accumulator.
  • Multiply value - place the product of the accumulator and the variable or immediate integer in the accumulator.
  • Divide value - place the contents of the accumulator divided by the value in the accumulator.
  • Halt - return control to console.