4.5: Continuation Lines

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\( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}} } \) \( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash {#1}}} \)\(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\) \(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\)\(\newcommand{\AA}{\unicode[.8,0]{x212B}}\)

A statement must start on a new line. If a statement is too long to fit on a line, it can be continued on the next line with an ampersand ('&'). Even shorter lines can be split and continued on multiple lines for more readable formatting.

For example,

A = 174.5 * year    &
    + count / 100.0

Is equivalent to the following

A = 174.5 * year + count / 100.0

Note that the '&' is not part of the statement.

Example

The following trivial program illustrates the program formatting requirements and variable declarations.

! Example Program

program example1

implicit none
integer :: radius, diameter
integer :: height=100, width=150
real :: area, perimeter
real :: length = 123.5, distance=413.761
real, parameter :: pi = 3.14159
character(11) :: msg = "Hello World"
    write (*,*) "Greeting: ", msg

end program example1

In this example, a series of variables are defined (as examples) with most not used. The program will display Greeting: Hello World when executed. The following chapters will address how to use the variables to perform calculations and display results. Additional information regarding character variables is provided in chapter 11.