Intrinsic Types

Fortran 90 has three broad classes of object type,

• character;
• boolean;
• numeric.

these give rise to six simple intrinsic types, known a default types,

• CHARACTER for strings of one or more characters;
• LOGICAL for objects which have the values true or false;
• REAL (and DOUBLE PRECISION) for approximate, possibly fractional numbers;
• COMPLEX for complex numbers;
• INTEGER for exact whole numbers.

Other intrinsic types will be described later.

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