Help with C++ functions

[Spev]

So I made a function that generates a random number and the return value is the random number. I want two variables in my program to be equal to random numbers. Basically it's like this:

 

randomNumber1 = randomNumberFunction (variable1, variable2)

randomNumber2 = randomNumberFunction (variable1, variable 2)

 

When I run the program it produces a random number but it produces the same random number for both randomNumber1 and randomNumber2. I want it to produce two different random numbers. The randomNumberFunction just returns the random number calculation value. Help?

 

P.S. Variable 1 and 2 are the min and max boundaries for the random number generator.

[Spev]

So instead of seeding my rand function in the function I seeded it in main, and now it produces two random numbers. Can anyone explain the reasoning behind this?

[Enderman]

its the way random works, its not actually random, its semi-random

it uses seeds

http://www.cplusplus.com/forum/beginner/5131/

http://stackoverflow.com/questions/9459035/c-rand-gives-same-number-when-running-process

 

btw its pretty much impossible to make a computer produce an actually random number

[Spev]

1 minute ago, Enderman said:

its the way random works, its not actually random, its semi-random

it uses seeds

http://www.cplusplus.com/forum/beginner/5131/

 

btw its pretty much impossible to make a computer produce an actually random number

That's not what I'm referring to but I know what you're talking about. I'm seeding rand with the time function (number of seconds in unix time since like 1970) which will produce a random number, every time, even on restarts of the program. If you seed it with the time function it's constantly fluctuating so it's not going to produce the same random number upon multiple restarts for example. Anyways getting a truly random number from the function wasn't the problem, it was where it was seeded I guess. If I seed in main it works fine, but if I seed in the function it produces the same random result. Hopefully you get what I'm saying I'm bad at explaining stuff.

 

[Enderman]

11 minutes ago, Spev said:

That's not what I'm referring to but I know what you're talking about. I'm seeding rand with the time function (number of seconds in unix time since like 1970) which will produce a random number, every time, even on restarts of the program. If you seed it with the time function it's constantly fluctuating so it's not going to produce the same random number upon multiple restarts for example. Anyways getting a truly random number from the function wasn't the problem, it was where it was seeded I guess. If I seed in main it works fine, but if I seed in the function it produces the same random result. Hopefully you get what I'm saying I'm bad at explaining stuff.

 

Yeah it might be because its getting called at pretty much the same time and therefore the seed is identical?