Generate a random number in a float range

Question

How can we generate a random number between a range in float numbers (in delphi xe3)?

For example, randomize a number between [0.10 to 0.90] . I need to give results, for example:

[ 0.20 , 0.32 , 0.10 , 0.50 ]

Thanks for the decision ....

Answer 1

 var float : Double; float := Random; // Random float in range: 0 <= float < 1 float := 0.1 + float*0.8 // 0.1 <= float < 0.9 

To initialize the random number generator, make one call to Randomize or set the RandSeed parameter before calling the Random function for the first time.

Do not do this, generates the same sequence each time the program starts. Note, however, that this sequence is not guaranteed when recompiling for another version of the compiler.

Answer 2

Another option is to use RandomRange (returns: AFrom <= r < ATo ) as follows:

 RandomRange(10, 90 + 1) / 100 

or

 RandomRange(10, 90 + 1) * 0.01 

will return numbers between 0.10 and 0.90 (including 0.90)

Answer 3

 function RandomRangeF(min,max:single):single; var float : single; begin float := Random; result := min + float* (max-min); end;