Srand time 0意思

The srand function is a C/C++ function that is used to initialize the random number generator with a seed value. The time parameter is used as the seed for the random number generator. The 0 parameter is an integer that is used as the seed for the random number generator.

Here is the syntax of the srand function:

void srand(unsigned int seed);

The srand function takes one parameter:

The time parameter is a function that returns the current time as a long integer. When you pass time(0) to srand, it means that the random number generator is being seeded with the current time as the seed. This is a common way to initialize the random number generator because it ensures that the seed is different every time the program is run, which results in a different sequence of random numbers being generated.

Here is an example of how you might use srand and time to initialize the random number generator:

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

int main() {
    srand(time(0));

    // Use the random number generator
    int random_number = rand();
    printf("Random number: %d\n", random_number);

    return 0;
}

In this example, the srand function is called with time(0) as the seed. This will initialize the random number generator with a different seed every time the program is run, which will result in a different sequence of random numbers being generated every time.