Use of qsrand, random method that is not random
- by Andy M
Hey everyone,
I'm having a strange problem here, and I can't manage to find a good explanation to it, so I thought of asking you guys :
Consider the following method :
int MathUtility::randomize(int Min, int Max)
{
qsrand(QTime::currentTime().msec());
if (Min > Max)
{
int Temp = Min;
Min = Max;
Max = Temp;
}
return ((rand()%(Max-Min+1))+Min);
}
I won't explain you gurus what this method actually does, I'll instead explain my problem :
I realised that when I call this method in a loop, sometimes, I get the same random number over and over again... For example, this snippet...
for(int i=0; i<10; ++i)
{
int Index = MathUtility::randomize(0, 1000);
qDebug() << Index;
}
...will produce something like :
567
567
567
567...etc...
I realised too, that if I don't call qsrand everytime, but only once during my application's lifetime, it's working perfectly...
My question : Why ?
