How to make a calculator that calculates the given math equation automatically and types in the answer??

[enes]

i am trying to find a calculator that automaticly calculates the simple equation on screen and types it in automaticly also. it should do this in 60 seconds. please help me find out this problem, thanks!

[ciphermagi]

http://www.cplusplus.com/forum/beginner/1/#msg6680