Seeding Random Number Generator

This is a discussion on Seeding Random Number Generator within the C++ Programming forums, part of the General Programming Boards category; Could someone show me some good ways to seed the random number generator in both C and C++?...

  1. #1
    Registered User zdude's Avatar
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    Seeding Random Number Generator

    Could someone show me some good ways to seed the random number generator in both C and C++?
    Those who live by the sword get shot by those who don't.

    I can C.

    Compiler: gcc

  2. #2
    Registered User zdude's Avatar
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    I wanted to know how to do it in C++ too, randomize does not work in C++. (For me at least)
    Those who live by the sword get shot by those who don't.

    I can C.

    Compiler: gcc

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    Still A Registered User DISGUISED's Avatar
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    Did you read the whole thing?

    Straight from the FAQ
    That said: There is more than one way to initialize the random seed (other than randomize). Randomize will not work under all compilers. And since the seed must be initialized (or the numbers will not be random) here is the other way:

    #include <stdlib.h> //for rand

    #include <stdio.h> //for printf

    #include <time.h> //for time



    int main(void)

    {

    srand(time(NULL));

    printf("A random number from 0 to 99: %d", rand() % 100);

    return 0;

    }


    srand initilizes the seed based on the number inputed. Normally time() is used so that the number is different each time the program is run. If you use srand(x); (where x is equal to any constant number) you will recieve random numbers but they will be the same on each execution.

    Q: But, how do i get a number between x and y? Like a die or something?
    A: Use a function like this one...



    int rand_mid(int low, int high)

    {

    return low+rand()%(high-low+1);

    }

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