Link Error : L1822: Symbol _FSFLOAT in file C:\Documents and Settings\Administrator\桌面\tiaosu\tiaosu_Data\SofTec_HCS12\ObjectCode\main.c.o
is undefined

Link Error : L1822: Symbol _FMUL in file C:\Documents and Settings\Administrator\桌面\tiaosu\tiaosu_Data\SofTec_HCS12\ObjectCode\main.c.o
is undefined

Link Error : L1822: Symbol _FADD in file C:\Documents and Settings\Administrator\桌面\tiaosu\tiaosu_Data\SofTec_HCS12\ObjectCode\main.c.o
is undefined

Link Error : L1822: Symbol _FSTRUNC in file C:\Documents and Settings\Administrator\桌面\tiaosu\tiaosu_Data\SofTec_HCS12\ObjectCode\main.c.o
is undefined

Link Error : Link failed

我只是把PID程序里整形变量——积分因子改成浮点型变量，结果就报错了，请高手指点一下