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

Question

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

include <iostream> using namespace std;  int main() {     cout << (rand() % 100);     return 0; } 

Why am I always getting an output of 41? I'm trying to get it to output some random number between 0 and 100. Maybe I'm not understanding something about how the rand function works?

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/

Answer 2

You need to "seed" the generator. Check out this short video, it will clear things up.

https://www.thenewboston.com/videos.php?cat=16&video=17503