How can I create a 2D array data, 100*100 with float number between 0 and 10 ?

I use this function to generate random values :

// obtain a random value scaled to be within limits

template< typename T >
inline T GetRandomValue( T minval, T maxval )
{
	return ( rand() * ( maxval - minval ) / (T) RAND_MAX ) + minval;
}

Converting that to a non-template function, it can look like this :

// obtain a random value scaled to be within limits

inline float GetRandomValue( float minval, float maxval )
{
	return ( rand() * ( maxval - minval ) / (float) RAND_MAX ) + minval;
}

then you can call it like this :

float value = GetRandomValue( 0.0f, 10.0f );

Remember to seed the PRNG with srand. Here is one way :

short seed = short( time(NULL) % RAND_MAX );
srand( seed );

for a unique sequence almost every time. Seed it with the same value for a repeatable sequence, preferably a prime number like 43.