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carraysrandomsrand

Generating array with random integers C

so I am trying to fill an array with random integers.

for (int i = 0; i < 2; i++){
    srand(time(NULL));
    array[i]=rand()%30; }`

Here is my code so far. I am currently getting the same random number twice. Would like to know if there is a way around this?

Solution

  • rand() usually uses a PRNG, which uses the seed to generate the random number. srand ( time(NULL) ); is used to seed the pseudo-random number generator.

    Currently, the time granularity of time() is 1 second, so if you seed the PNRG with the same value [time(NULL);] multiple time within the granularity period, call will to rand() generate the same random number.

    Move the srand(time(NULL) outside the loop.