How to generate random numbers on intervals

[eharaeheu]

Is there any basic formula?
Id like to know how do i random up numbers on interval (-201,201) and [-205,205)

[shadowCODE]

Rand() return random numbers from 0.
Generate number from 0 to 402 and subtract 201

Same approach for -205 to 205

[jheard901]

So, basically as was just described it would look something like this:

//create random int between a - b | only works on positive numbers
int GetTrueRandomInt(int a, int b)
{
	if (a >= b)	// bad input
		return a;

	int c = (b - a) + 1;
	return rand() % c + a;
}

If you wanted to get a random number using negative numbers then you would change the function to get the absolute value of c.