random number generation with at89c51 using C

[nyxon]

i m tryin to create a dice for which random no. generation is necessary.
i had used rand() function under stdlib.h but it keeps on givin the same no.
what are other method of generation random no. using C language

my code was like this

int r;
r=rand()%7;

this should generate random no. between 0 to 6 but instead it generated only 2 every time it is executed.

plz help!!

 

[ckshivaram]

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[andre_luis]

nyxon

You must provide the seed before call that function.
That´s because RAND performs a pseudo-randomizing algorithm.
Generally we use an assyncron event to trigger an internal uC counter and feed the function.

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