FORTRAN 77 "Error: Unclassifiable statement at (1)"

Question

这个程序:

C This program calculates cos(x**2)

      PROGRAM COSX_SQUARE
      IMPLICIT NONE
      INTEGER a
      REAL y, r

      PRINT*, 'INPUT THE DEGREE'
      PRINT*, 'BETWEEN 0 AND 360'
      READ*, a

      a*(3.141592/180) = y

C This part determines minus sign and calculates the function

      IF (a .GT. 90) THEN
         r = -(1-(y**4)/2+(y**8)/24-(y**12)/720+(y**16)/40320)
      ELSEIF (a .GE. 270) THEN
         r = 1-(y**4)/2+(y**8)/24-(y**12)/720+(y**16)/40320
      ELSEIF (a .GT. 360) THEN
         PRINT*, 'INVALID DEGREE'
         PRINT*, 'DEGREE MUST BE BETWEEN 0 AND 360'
      ELSEIF (a .LT. 0) THEN
         PRINT*, 'INVALID DEGREE'
         PRINT*, 'DEGREE MUST BE BETWEEN 0 AND 360'
      END IF

      PRINT*, 'THE RESULT OF COS', a, 'SQUARE IS = ', r

      STOP
      END

给出这个错误:

    a*(3.141592/180)=y                                
    1
Error: Unclassifiable statement at (1)

我已经定义了 a作为整数。为什么这个错误不断出现？

Answer 1

是的。它是一个开始语句的表达式。也许把它改成

  y = a*(3.141592/180)

如果那是你真正的意思。