How do the "random" generators in different languages (i.e. Java and C++) compare? -

despite weird title, wish ask legitimate question: method's generated numbers more random: java's random() class or math.random(), or c++'s rand()?

i've heard php's rand() quite bad, i.e. if map results can see pattern; sadly, don't know how draw map in c++ or java.

also, out of interest, c#?

both java , c++ generate pseudo-random numbers either:

• adequate task isn't statistician or cryptographer ^(a); or
• woefully inadequate 2 classes of people.

in honesty, unless are in 1 of classes, pseudo-random number generators fine.

java has securerandom purports provide crypto-class non-determinism (i can't comment on veracity of argument) , c++ has wider variety of random number generation capability rand() - see <random> details.

specific operating systems may provides sources of entropy random number generators such cryptgenrandom under windows or reading /dev/random under linux. alternatively, add entropy using random events such user input timing.

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^(a) may contain traces of other job types aren't statistician or cryptographer :-)