Home > Article > Backend Development > Why Do I Get the Same Random Numbers in Each Loop Iteration?
Why Do I Get Same Random Numbers in Each Loop Iteration?
In your loop, you have implemented the srand(time(0)) function, intending to generate unique random numbers. However, upon observation, you noticed that the carSetter and decider variables consistently print the same value within each loop run.
This behavior is attributable to the nature of the srand() function. When called, srand() initializes the seed of the random number generator based on the specified parameter. In this case, time(0) is used, which represents the current time in seconds. However, since the loop executes swiftly, the time(0) value remains the same throughout the loop iterations. Consequently, the seed doesn't change, resulting in the same sequence of pseudo-random numbers every time.
To address this issue, it's recommended to call srand() only once at the beginning of your program, initializing the seed with a variable or value that won't change during the loop execution. This will ensure the generation of unique random numbers in each iteration.
The above is the detailed content of Why Do I Get the Same Random Numbers in Each Loop Iteration?. For more information, please follow other related articles on the PHP Chinese website!