脑子糊涂了，咋忘了这一条，还忙活了半天，判断其他地方呢

谢谢啦

编程时，时刻记住，浮点数是有误差的。

所以不做浮点数相等判断。

而改用差的绝对值小于某个很小的数。

[Fortran] syntaxhighlighter_viewsource syntaxhighlighter_copycode

PROGRAM MAIN
    IMPLICIT NONE
    INTEGER::I,J,K
    INTEGER::DEMCOLS,DEMROWS    !DEM数据列数、行数
    INTEGER::DEMNODATA          !DEM无效值
    INTEGER,ALLOCATABLE,DIMENSION(:,:)::PROVALUE
    REAL::CORNERLON,CORNERLAT,CELLSIZE
    REAL,ALLOCATABLE,DIMENSION(:,:)::DEMLON,DEMLAT
    CHARACTER(LEN=30)::DEMTEMP
    OPEN(UNIT=1201503,FILE="DATA.txt")
    READ(1201503,*)DEMTEMP,DEMCOLS
    READ(1201503,*)DEMTEMP,DEMROWS
    READ(1201503,*)DEMTEMP,CORNERLON
    READ(1201503,*)DEMTEMP,CORNERLAT
    READ(1201503,*)DEMTEMP,CELLSIZE
    READ(1201503,*)DEMTEMP,DEMNODATA
    ALLOCATE(PROVALUE(DEMROWS,DEMCOLS),DEMLON(DEMROWS,DEMCOLS),DEMLAT(DEMROWS,DEMCOLS))
    DO I=1,DEMROWS
        DEMLAT(I,:)=CORNERLAT+(DEMROWS-I)*CELLSIZE
    END DO
    DO I=1,DEMCOLS
        DEMLON(:,I)=CORNERLON+(I-1)*CELLSIZE
    END DO
    DO I=1,DEMROWS
        READ(1201503,*)(PROVALUE(I,J),J=1,DEMCOLS)
    END DO
    OPEN(UNIT=2201501,FILE="ResultsCAREPOINTS.txt")
    DO J=1,DEMROWS
        DO K=1,DEMCOLS
            IF((DEMLON(J,K)==101.95.AND.DEMLAT(J,K)==27.05).OR.(DEMLON(J,K)==101.45.AND.DEMLAT(J,K)==26.95).OR.(DEMLON(J,K)==101.75.AND.DEMLAT(J,K)==26.65))THEN
                WRITE(2201501,'(2F10.3,I10)')DEMLON(J,K),DEMLAT(J,K),PROVALUE(J,K)
            END IF
        END DO
    END DO
END PROGRAM