Viktor的Fortran手记之三 风格、选择与效果

Viktor posted @ Jul 30, 2008 05:35:40 AM in FORTRAN with tags fortran Viktor , 2673 阅读

 

implicit none

 

 

以绕过I--N规则。(呵呵,一句名言,"God is Real until claimed as Integer. "嗯……然则min一类习惯的名字就要小心了……)

  • 在subroutine和function里,所有的local var.都默认是STORE的。什么意思呢?比如说,
    function xxoo(...)
        ...
        integer :: ooxx = 1
        ...

        ooxx = ooxx + 1
       
        ...
    end function xxoo

只有第一次xxoo(...)的时候,ooxx才是1.以后就会变成2,3,4,5,……如果要避免这个副作用,就得写

 

function xxoo(...)
    ...
    integer :: ooxx
    ...

    ooxx = 1 !Here to initialize ooxx
   
    ...
end function xxoo

C里面可是默认全都毁掉的,不要混了……

  • 有的地方说inout要写成in out,goto要写成go to,然则得视编译器而定。
  • 注释写感叹号,续行就用&,从第9列写起(兼容Tab和古典FORTRAN格式)。第5列(按一个Tab)写行号的个位。第6列一定要让它空着!除非续行的时候,可以写&。需要兼容性的时候,这是必须的。
  • 虽然新Fortran支持长名字,然则还是写6字符以内的短名比较好。小猫见过hankei和takasa之类诡异的名字……
  • 循环里严格禁止改循环变量:
    do i = 1, n
        i = exFlag !Compile error!
        ...
    end do
  • 最应该记住的,是调用function的时候得事先在块中声明……
  • module是个好东西,声明什么的都可以往里装。还可以用它实现运算符重载和多态函数……C++用的是类,这里用的就是TYPE……
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