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A CSMP III program is constructed from three general types of statements:
Structural statements, which define the model. They consist of FORTRAN-likestatements, and functional blocks designed for operations that frequently occour in a model definition.
Data statements, which assign numerical values to parameters, constants, and initial conditions.
Control statements, which specify options in assembly and execution of the program, and the choice of output.
Structural statements can make use of the operations of addition, subtraction, multiplication, division, and exponentiation, using the same notation and rules as are used in FORTRAN. If, for example, the model includes the equation
the following statement will be used: