Array Bounds

• the Fortran Standard says nothing about array-bounds-checking;
  
  
• if an array subscript is used which is outside of the declared extents:
  • the programme may crash;
  • an array-bound error may be given;
  • the programme may continue but yield incorrect results;
  depends on the compiler and compiler options;
  
• array-bounds-checking is inefficient --- use in development;

Examples

Sun compilers:

    f90 -g my_code.f90

• -g: compile for debugging;

NAg compilers:

    F90 -C=array my_code.f90

• -C: compile in run-time code, in this case for array-bound checking;