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crandom

generate a random number between 1 and 10 in c

#include <stdio.h>
#include <stdlib.h>

int main()

{
    int randomnumber;
    randomnumber = rand() % 10;
    printf("%d\n", randomnumber);
    return 0;
}

This is a simple program where randomnumber is an uninitialized int variable that is meant to be printed as a random number between 1 and 10. However, it always prints the same number whenever I run over and over again. Can somebody please help and tell me why this is happening? Thank you.

Solution

  • You need a different seed at every execution.

    You can start to call at the beginning of your program:

    srand(time(NULL));

    Note that % 10 yields a result from 0 to 9 and not from 1 to 10: just add 1 to your % expression to get 1 to 10.