akohan
asked on
scientific numbers in C++
Hello group,
In a calculation I'm counting which gives result in scientifice number due to using Factorial such
26!/(26-4)! and ...
What varaible can I use? do I need to use template in C++? or how about PHP/JavaScript if you want to implement it in Web (either one)
Your help will be appreciated greatly.
Regards,
Amit
In a calculation I'm counting which gives result in scientifice number due to using Factorial such
26!/(26-4)! and ...
What varaible can I use? do I need to use template in C++? or how about PHP/JavaScript if you want to implement it in Web (either one)
Your help will be appreciated greatly.
Regards,
Amit
ozo
printf("%d\n",25*24*23*21)
Sorry, that should have been
26*25*24*23
26*25*24*23
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>> What varaible can I use?
A normal 32bit int should be fine, assuming that you calculate it correctly. Do NOT try to store 26! in it ;) A 32bit int can't hold the result :) Calculate like ozo showed.
>> do I need to use template in C++?
I do not see why ? This is a simple calculation ... Or do you want to make your code generic to calculate x!/(x-y)! ??
A normal 32bit int should be fine, assuming that you calculate it correctly. Do NOT try to store 26! in it ;) A 32bit int can't hold the result :) Calculate like ozo showed.
>> do I need to use template in C++?
I do not see why ? This is a simple calculation ... Or do you want to make your code generic to calculate x!/(x-y)! ??
358800
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To be extra safe, you might want to check the input x and y values for overflow ... If the difference between them is too small, the result will not be correct.
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