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well, it does make a difference, it is possible that your compiler includes that headerfile by default, but another one might not, thats why it is best to include it anyway.

hope this makes sence...

i don't think it will, but to keep it compatible with other compilers, you should add it ;)

i can't believe it is machine dependant, i think it is OS dependant. if you want it to use for windows, then include windowsx.h. this will allow you to use the sleep function in miliseconds.

for...