Simple calculator, addition and subtraction can be achieved that the operator 4, 4 × 4 keyboard, four outputs, digital tube display

DynamicLED.DSN
DynamicLED.PWI
Keil
....\Calculator.lst
....\Calculator.obj
....\CalReady.lst
....\CalReady.obj
....\CalReady.__i
....\DynamicLED
....\DynamicLED.hex
....\DynamicLED.lnp
....\DynamicLED.M51
....\DynamicLED.Opt
....\DynamicLED.plg
....\DynamicLED.Uv2
....\DynamicLED_Opt.Bak
....\DynamicLED_Uv2.Bak
....\include
....\.......\AT89X51.H
....\.......\Calculator.h
....\.......\CalReady.h
....\.......\includes.h
....\.......\KeyProcess.h
....\.......\KeyScan.h
....\.......\LED6Show.h
....\.......\REG51.H
....\.......\TimeProcess.h
....\.......\Timer.h
....\KeyPorcess.lst
....\KeyPorcess.obj
....\KeyPorcess.__i
....\KeyScan.lst
....\KeyScan.obj
....\LED6Show.lst
....\LED6Show.obj
....\LED6Show.__i
....\main.lst
....\main.obj
....\sources
....\.......\Calculator.c
....\.......\CalReady.c
....\.......\KeyPorcess.c
....\.......\KeyScan.c
....\.......\LED6Show.c
....\.......\main.c
....\.......\TimeOppose.c
....\.......\TimeProcess.c
....\.......\Timer.c
....\TimeOppose.lst
....\TimeOppose.obj
....\TimeOppose.__i
....\TimeProcess.lst
....\TimeProcess.obj
....\TimeProcess.__i
....\Timer.lst
....\Timer.obj
....\Timer.__i
Last Loaded DynamicLED.DBK
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