What is the use of rand () in c?

Question

It gives same output for all the executions

Answer 1

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Answer 2

Explanation please i can't have any idea

Answer 3

The rand() function isn't actually providing a "random" number.

It uses a seed as Fermi mentioned, and from it, the so called "random" numbers are generated with some logic that shouldn't bother you.

So when you use the 'srand(time(0))' you're basically telling the compiler to use the current time (in milliseconds if I'm not mistaking) as a seed. Therefore the chance of generating the same number every time is very slim and it feels like a real random.

Answer 4

Remember to seed your RNG using srand().

#include <iostream>
#include <cstdlib>
#include <ctime>

int main() {
srand(time(0));
std::cout << rand();
}