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FORTRAN DO Loops

• FORTRAN 77 and 90

• Syntax:

      DO label var = start, finish [, stepsize]
  

• Stepsize can be any value but zero

• Parameters can be expressions

• Design choices:
  • Loop var can be INTEGER, REAL, or DOUBLE
  • Loop var always has its last value
  • Loop parameters are evaluated only once
  • The loop var cannot be changed in the loop, but the parameters can; because they are evaluated only once, it does not affect loop control