インテル® Fortran コンパイラー 19.0 デベロッパー・ガイドおよびリファレンス
The data type of a scalar variable can be explicitly declared in a type declaration statement. If no type is declared, the variable has an implicit data type based on predefined typing rules or definitions in an IMPLICIT statement.
An explicit declaration of data type takes precedence over any implicit type. Implicit type specified in an IMPLICIT statement takes precedence over predefined typing rules.