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POC++ Faulty Random Numbers
 

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    <p>I'm creating a machine that generates a shotgun with random components that effect the overall quality of the gun. I'm having a problem generating the random parts that will comprise the shotgun. There are 4 parts that have to be generated. When I created each of these functions, I tested them individually and they all work but when I try to put them together with the <code>createChromo()</code> function, the numbers are individually random. I should be getting results like 2131 and 1332, but I keep getting 1111 or 1112 or 2221 or 2222....Here is the code:</p> <pre><code>int generateButt() { srand(unsigned(time(NULL))); int buttType = rand() % 3 + 1; if(buttType == 1) { accuracy = rand() % ((5 - 2) + 2) / 10.0; fireRate = fireRate - 0.3; } if(buttType == 2) { accuracy = rand() % ((8 + 5) + 5)/ 10.0; fireRate = fireRate - 0.2; } if(buttType == 3) { accuracy = rand() % ((11 + 8) + 8) / 10.0; fireRate = fireRate - 0.1; } return buttType; } int generateBarrel() { srand(unsigned(time(NULL))); int barrelType = rand() % 3 + 1; if(barrelType == 1) { range = rand() % (16 - 5) + 5; power = power + 3; } if(barrelType == 2) { range = rand() % (21 - 16) + 16; power = power + 1; } if(barrelType == 3) { range = rand() % (26 + 21) + 21; power = power - 1; } return barrelType; } int generateBullet() { srand(unsigned(time(NULL))); int bulletType = rand() % 3 + 1; if(bulletType == 1) { power = rand() % (16 - 10) + 10; range = range + 5; } if(bulletType == 2) { power = rand() % (26 - 16) + 16; range = range + 1; } if(bulletType == 3) { power = rand() % (35 - 26) + 26; range = range - 2; } return bulletType; } int generateAction() { srand(unsigned(time(NULL))); int actionType = rand() % 2 + 1; if(actionType == 1) { fireRate = 1.5; accuracy = accuracy + 0.2; } if(actionType == 2) { fireRate = 2.0; accuracy = accuracy - 0.1; } return actionType; } void createChromo(int a, int b, int c, int d) { cout &lt;&lt;a&lt;&lt;b&lt;&lt;c&lt;&lt;d&lt;&lt;"\n"; } int main() { for(int i = 0; i &lt; popSize; i++) createChromo(generateButt(), generateBarrel(), generateBullet(), generateAction()); system("pause"); return 0; } </code></pre>
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    1. COYou should be calling `srand` **once**.
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    2. CO@chris - you should make that the answer that the random sequence is not seeded - funny enough this was an inspection issue on a colleges code today :-)
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      1. USAdrian Cornish
    3. CO@AdrianCornish, Seemed a bit weeny, but yeah, I guess.
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