[文件读写] 怎么输出文件都有错

      write(xname, '(A, I8, A)') 'data1/t=',itimestep,'step_xv.dat'
      write(sname, '(A, I8, A)') 'data/zs',itimestep,'step_state.dat'
      write(oname, '(A, I8, A)') 'data/zs',itimestep,'step_other.dat'
      
      open (1,file=xname)
      open (2,file=sname)
      open (3,file=oname)