看不懂的错误提示First non-blank character in a character type format ...

麦田守望者

一个简单的程序，就是编译不出来，错误提示看不懂

[Fortran] 纯文本查看 复制代码

PROGRAM capacitor
IMPLICIT NONE

! Data dictionary: declare constants
REAL, PARAMETER :: ELECTRONS_PER_COULOMB = 6.241461E18 

! Data dictionary: declare variable types, definitions, & units
REAL :: c         ! Capacitance of the capacitor (farads).
REAL :: charge    ! Charge on the capacitor (coulombs).
REAL :: electrons ! Number of electrons on the plates of the capacitor
REAL :: energy    ! Energy stored in the electric field (joules)
INTEGER :: type   ! Type of input data available for the calculation:
                  !  1:  C and V
                  !  2:  CHARGE and V
REAL :: v         ! Voltage on the capacitor (volts).

! Prompt user for the type of input data available.
WRITE (*, 100)
100 FORMAT (' This program calculates information about a ' &
            'capacitor.',/, ' Please specify the type of information',&
            ' available from the following list:',/,&
            '   1 -- capacitance and voltage ',/,&
            '   2 -- charge and voltage ',//,&
            ' Select options 1 or 2: ')

! Get response and validate it.
DO
   READ (*,*) type
   IF ( (type == 1) .OR. (type == 2) ) EXIT
   WRITE (*,110) type
   110 FORMAT (' Invalid response: ', I6, '.  Please enter 1 or 2:')
END DO

! Get additional data based upon the type of calculation.
input: IF ( type == 1 ) THEN
    
   ! Get capacitance.   
   WRITE (*,' Enter capacitance in farads: ')    
   READ (*,*) c
   
   ! Get voltage.
   WRITE (*,' Enter voltage in volts: ')                   
   READ (*,*) v
 
ELSE 
 
   ! Get charge
   WRITE (*,' Enter charge in coulombs: ')                 
   READ (*,*) charge

   ! Get voltage.
   WRITE (*,' Enter voltage in volts: ')                   
   READ (*,*) v
 
END IF input

! Calculate the unknown quantities. 
calculate: IF ( type == 1 ) THEN
   charge = c * v                            ! Charge
ELSE 
   c = charge / v                            ! Capacitance
END IF calculate
electrons = charge * ELECTRONS_PER_COULOMB   ! Electrons
energy = 0.5 * c * v**2                      ! Energy
 
! Write out answers.
WRITE (*,120) v, c, charge, electrons, energy 
120 FORMAT (' For this capacitor: ',/, &
            '   Voltage             = ', F10.2, ' V',/, &
            '   Capacitance         = ', ES10.3, ' F',/, &
            '   Total charge        = ', ES10.3, ' C',/, &
            '   Number of electrons = ', ES10.3,/, &
            '   Total energy        = ', F10.4, ' joules' )
 
END PROGRAM capacitor

错误提示：First non-blank character in a character type format specifier must be a left parenthesis.   [' Enter capacitance in farads: ']

fcode

WRITE (*,' Enter capacitance in farads: ')   
改为
WRITE (*,'("Enter capacitance in farads: ")')   

其他几处类同

麦田守望者

fcode 发表于 2014-8-26 22:05
WRITE (*,' Enter capacitance in farads: ')   
改为
WRITE (*,'("Enter capacitance in farads: ")')   

谢谢！
是不是写在write里面的必须加括号啊？
我试了单引号加双引号可以，双引号加单引号也可以，如果是相同的引号就不行，这个详细的是怎么规定的啊，有点不清楚

珊瑚虫

麦田守望者 发表于 2014-8-27 10:32
谢谢！
是不是写在write里面的必须加括号啊？
我试了单引号加双引号可以，双引号加单引号也可以，如果是 ...

试验出来的就是规矩，以后在使用中就有经验了，就按照这个经验来。

麦田守望者

珊瑚虫 发表于 2014-8-27 10:40
试验出来的就是规矩，以后在使用中就有经验了，就按照这个经验来。

嗯，实践出真知啊

vvt

Fortran 的单引号，双引号是等价的。
但是，如果引号里面还有引号，就会冲突。所以需要单引号和双引号间隔使用。
WRITE (*,'("Enter capacitance in farads: ")')  
与
WRITE (*,"('Enter capacitance in farads: ')")
是同一个意思。

麦田守望者

vvt 发表于 2014-8-27 12:16
Fortran 的单引号，双引号是等价的。
但是，如果引号里面还有引号，就会冲突。所以需要单引号和双引号间隔 ...

这样的啊，谢谢~