c/c++ - random number between 0 and 1 without using rand() [duplicate]

This question already has an answer here:

• How do I generate random numbers without rand() function? 8 answers

I am trying to generate a (pseudo) random number between 0 and 1 without using any functions like rand() or srand(). I found some answers here but none fit my problem.

I was thinking about something like

• declaring a variable and getting a pointer to that variable
• add a number to the pointer to get another pointer to a unknown memory address (I know it is bad practise)
• doing some modulo operations and some bit shifting on the new variable I would like it to be as distributed as possible

thanks!