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| <h4 class="subsection">6.1.2 Old-style variable initialization</h4> |
| |
| <p>GNU Fortran allows old-style initialization of variables of the |
| form: |
| </p><div class="smallexample"> |
| <pre class="smallexample"> INTEGER i/1/,j/2/ |
| REAL x(2,2) /3*0.,1./ |
| </pre></div> |
| <p>The syntax for the initializers is as for the <code>DATA</code> statement, but |
| unlike in a <code>DATA</code> statement, an initializer only applies to the |
| variable immediately preceding the initialization. In other words, |
| something like <code>INTEGER I,J/2,3/</code> is not valid. This style of |
| initialization is only allowed in declarations without double colons |
| (<code>::</code>); the double colons were introduced in Fortran 90, which also |
| introduced a standard syntax for initializing variables in type |
| declarations. |
| </p> |
| <p>Examples of standard-conforming code equivalent to the above example |
| are: |
| </p><div class="smallexample"> |
| <pre class="smallexample">! Fortran 90 |
| INTEGER :: i = 1, j = 2 |
| REAL :: x(2,2) = RESHAPE((/0.,0.,0.,1./),SHAPE(x)) |
| ! Fortran 77 |
| INTEGER i, j |
| REAL x(2,2) |
| DATA i/1/, j/2/, x/3*0.,1./ |
| </pre></div> |
| |
| <p>Note that variables which are explicitly initialized in declarations |
| or in <code>DATA</code> statements automatically acquire the <code>SAVE</code> |
| attribute. |
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