generate random value

[momogi]

I'm making a TSP (Travelling Salesman Problem) project in Simulated Annealing Method.
Here, I need to add a condition to the generated random value.
I wanna ask you, how to generate two random value in which the first random value must bigger than the second one. random1>random2

here the code I have :

for (int i=1;i<=2;i++)
 printf("%d\n", rand());

thanks....

[gpraghuram]

I'm making a TSP (Travelling Salesman Problem) project in Simulated Annealing Method.
Here, I need to add a condition to the generated random value.
I wanna ask you, how to generate two random value in which the first random value must bigger than the second one. random1>random2

here the code I have :

for (int i=1;i<=2;i++)
 printf("%d\n", rand());

thanks....

Random means you cant guarantee that the second value will be greater than the first one.
What you can do is you can call rand in loop till you can get the second one greater than second.

Raghuram

[mac11]

Alternatively, you can simplify things greatly like this:

// grab two random numbers, you don't care what they are
random1 = get_me_a_random_number();  // get a random number
random2 = get_me_a_random_number();  // get another random number

// then see if random2 is greater than random1, if the second one is
// greater than the first one just swap em so they appear to have come in the
// order you want
if( random2 > random1 )  
{
    // random2 is greater than random1 - swap 'em so random1 is bigger
    swap( random2, random1 );
}

// now we know random1 is bigger (or they might be the same I guess)
printf( %d is greater than or equal to %d\n", random1, random2 );

They are both random numbers, you just use a little logic to figure out which one is greater and you don't have to sit in a loop waiting.

I guess if you want to make absolutely sure they aren't equal (which is very unlikely) you will need a loop, but it won't actually loop very often.

[gpraghuram]

Very good idea.
I went for a approach which is not very efficient

Raghuram