rand() and normalize

[mickey0]

Hello,

I need to generates random number but between -0.5 and 0.5;

srand( time(NULL) );
double number[5];
for (int i=0; i < 5; i++) {
   number = rand() ;
}

What's the best way? Sincerly I haven't idea how to do; I could normalize them but to do they between -0.5 and 0.5 ? I thought to do numberNormalize d - 0.5; But I notice that in this way the final number are always negative....
Any hints?

[weaknessforcats]

Does rand() return a double? Have you looked? If rand() does not return a double, then how do you get a decimal??

[mickey0]

Does rand() return a double? Have you looked? If rand() does not return a double, then how do you get a decimal??

No, it doesn't; but I can assign it to a double and then normalize the values;
Anyway; I know only rand() to generate numbers....

[arnaudk]

As w4cats suggests, you should really look at the documentation for rand(). The random number lies in the range 0 to RAND_MAX. So if you cast your random number to double, then divide it by RAND_MAX, you will have a random decimal number between 0 and 1. Then subtract 0.5.

Incidentally, if you want an array, line 4 should be number[i] = rand();