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CODE:
    IMPLICIT DOUBLE PRECISION (A-H,O-Z)
    dimension a(20),b(20),c(20)
    character*100 frmt

    a=1.d0
    b=2.d0
    c=3.d0

    write(*,*)"Please specify the number of columns (default: 5):"
    read(*,*) ncol
    if(ncol .lt. 1) ncol=5

    write(*,"(/,'a=')")
    do i=1,20
      write(*,"(f20.12)",advance='no')a(i)
      if(mod(i,ncol) .eq. 0) write(*,*)
    end do
    write(*,*)

    frmt='(    f11.3)'
    write(frmt(2:5),"(i4)")ncol
    write(*,"(/,'b=')")
    write(*,trim(frmt))b
    write(*,*)

    write(*,*)"Please specify the format (for example, 5f12.6):"
    read(*,*)frmt
    frmt="(" // trim(frmt) // ")"
    write(*,"(/,'c=')")
    write(*,trim(frmt))c

    end

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CODE:
    Please specify the number of columns (default: 5):
     3  Óû§ÊäÈë

Àý1£¬´òÓ¡Êý×éa¡£ÕâÀïÀûÓÃÁËFortran90ÒýÈëµÄÒ»¸öwreiteÑ¡Ïîadvance='no'£¬±íʾ´òÓ¡Ö®ºó²»»»ÐС£×¢Òâ´ËÑ¡Ïî¶ÔFortran 77±àÒëÆ÷£¨ÀýÈçpgf77£¬g77£©ÎÞЧ¡£Ã¿´ÎÖ»´òÓ¡Ò»¸öÊý×éµÄÔªËØ£¬µ±Êý¾Ý±àºÅÄܱ»ÁÐÊýÕû³ýʱ£¬Ö´ÐÐÒ»¸ö¿ÕµÄwriteÃüÁÆðµ½»»ÐÐ×÷Óá£Êä³öΪ£º
CODE:
    a=
          1.000000000000      1.000000000000      1.000000000000
          1.000000000000      1.000000000000      1.000000000000
          1.000000000000      1.000000000000      1.000000000000
          1.000000000000      1.000000000000      1.000000000000
          1.000000000000      1.000000000000      1.000000000000
          1.000000000000      1.000000000000      1.000000000000
          1.000000000000      1.000000000000

Àý2£¬´òÓ¡Êý×éb¡£ÕâÀïÀûÓÃ×Ö·û´®frmt´æ´¢Êä³ö¸ñʽ£¬²¢ÀûÓÃwriteÓï¾ä°Ñ×Ô¶¨ÒåµÄÕûÐÍÁÐÊý×÷Ϊ×Ö·û´òÓ¡µ½frmt£¬°ÑfrmtÔ¤ÁôµÄµÚ2µ½µÚ5¸ö×Ö·ûλÖøÄΪÓû§¶¨ÒåµÄÁÐÊý¡£ÔÚÉÏÃæµÄÀý×ÓÖУ¬frmt¸Äºó³ÉΪ(   3f11.3)¡£ÎÒÃÇÒ»°ãÖ»Êä³ö¼¸Áе½¼¸Ê®ÁУ¬Òò´ËÔ¤Áô4¸ö×Ö·ûλÖÃÒ»°ã×ã¹»ÁË¡£Êä³öΪ£º
CODE:
    b=
          2.000      2.000      2.000
          2.000      2.000      2.000
          2.000      2.000      2.000
          2.000      2.000      2.000
          2.000      2.000      2.000
          2.000      2.000      2.000
          2.000      2.000

Àý3£¬´òÓ¡Êý×éc¡£Õâ¸öÀý×Ó¿É¿´×÷ÊÇÀý2µÄÀ©Õ¹£¬Êä³ö¸üÁé»îһЩ¡£²»½öÊÇÁÐÊý£¬Ã¿¸öÔªËØµÄÊä³ö¸ñʽҲ¶¼ÓÉÓû§°´ÕÕFortranµÄ¸ñʽ¶¨Òå¡£ÀýÈ磺
CODE:
    Please specify the format (for example, 5f12.6):
       4d16.6    Óû§ÊäÈë

È»ºó¸ù¾ÝFortran¸ñʽ£¬»¹Òª°ÑǰºóµÄÀ¨ºÅ¼ÓÉÏ¡£Êä³öÈçÏ£º
CODE:
    c=
        0.300000D+01    0.300000D+01    0.300000D+01    0.300000D+01
        0.300000D+01    0.300000D+01    0.300000D+01    0.300000D+01
        0.300000D+01    0.300000D+01    0.300000D+01    0.300000D+01
        0.300000D+01    0.300000D+01    0.300000D+01    0.300000D+01
        0.300000D+01    0.300000D+01    0.300000D+01    0.300000D+01

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