Examples

Example 1: IMPLICIT: everything is integer:

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       IMPLICIT INTEGER (A-Z) 
       X = 3 
       K = 1 
       STRING = 0 

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Example 2: Complex if it starts with U, V, or W; character if it starts with C or S:

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       IMPLICIT COMPLEX (U,V,W), CHARACTER*4 (C,S) 
       U1 = ( 1.0, 3.0) 
       STRING = 'abcd'
       I = 0 
       X = 0.0 

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Example 3: All items must be declared:

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       IMPLICIT NONE 
       CHARACTER STR*8 
       INTEGER N 
       REAL Y 
       N = 100 
       Y = 1.0E5 
       STR = 'Length'

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In the above example, once IMPLICIT NONE is specified in the beginning. All the variables must be declared explicitly.

Example 4: A letter used twice: @

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       IMPLICIT INTEGER (A-Z)
       IMPLICIT REAL (A-C)
       C = 1.5E8
       D = 9

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In the above example, D through Z implies INTEGER, and A through C implies REAL.