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fortran90でコマンドライン引数を取得

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getarg(k,arg)
integer :: k !入力: 引数の索引 (0 = 最初の引数 = コマンド名) 
character :: arg*n !出力: k番目の引数
iargc()
integer :: iargc !返り値: コマンドラインの引数の個数
実行ファイル名のすぐ後の引数をoptionalに取得
integer :: i
character :: arg*10

if(iargc()>0)then !実行ファイル名以外の引数がある時
   call getarg( 1, arg ) !文字列として取得
   read(arg,*) i !整数に変換
else
   i=7 !無ければ適当な値
end if

fortran2000とかなら別のやり方があるらしい

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