random characters

hello, i need to make a program that generates a random character.
after that the user have to type the same character on the keyboard
the objective of the program is to calculate the reaction time of the user, i mean, calculate the time spend by the user between the creation of the random character and the input of the user.

i can generate the random character, type that character on the keyboard and see if it«s the same or not but i have no idea how to calculate the reaction time

if somebody can help me

thanks, rebok

Why don't you know how to calculate it? (Didn't you already post this thread? Or was that someone else, because I swear I just read this post some place.)

Code:

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nowtime = now
display character
read character from user
reaction time = now
elapse time = difference between nowtime and reaction time

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It's not hard if you take a bit of time to think about what's actually happening.

Quzah.

Using standard C functions, the reaction time won't be noticible if the user types fast. But it's possible to use clocks()/CLOCKS_PER_SECOND to find the reaction time down to the second. All that's necessary is to calculate the time before the input is entered and time after. Subtracting the two, dividing by CLOCKS_PER_SECOND, should then give you the reaction time.

Quote:

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Originally Posted by okinrus

(...)But it's possible to use clocks()/CLOCKS_PER_SECOND to find the reaction time down to the second.

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Not clocks() but clock()
Not CLOCKS_PER_SECOND but CLOCKS_PER_SEC

You may use this to get milliseconds:

Code:

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clock()*1000/CLOCKS_PER_SEC/1000.0

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And #include <time.h>

Try a google search for "X C timing functions" where X is your operating system.

Thanks, xerath. You can't get milliseconds granulity in a standard, portable way, however.