rand() returns the same number each time the program is run

Question

In this rather basic C++ code snippet involving random number generation:

include 
using namespace std;

int main() {
    cout << (rand() %         


        

Answer 1

You need to change the seed.

int main() {

    srand(time(NULL));
    cout << (rand() % 101);
    return 0;
}

the srand seeding thing is true also for a c language code.

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See also: http://xkcd.com/221/