求导\Exercise\1.cbp
....\........\1.depend
....\........\1.layout
....\........\bin\Debug\1.exe
....\........\main.cpp
....\........\obj\Debug\main.o
....\input_data.txt
....\Exercise\bin\Debug
....\........\obj\Debug
....\........\bin
....\........\obj
....\Exercise
求导