Every computer is limited in magnitude and precision. REAL has a specific number of significant digits. If for a calculation number of significant digits are required then DOUBLE PRECISION is used. For a 32-bit computer range REAL number can be up to 7 decimal digits and will have a magnitude ranging from 10-38 to 10+38. Now, DOUBLE PRECISION REAL numbers have the size ranging from 10-308 to 10+308 and twice the number of decimal digits.

Point to be noted: Go through this Q&A very thoroughly as this is one of the essential Fortran interview questions.

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