# Extra Clang Tools 4 documentation

## clang-tidy - cert-msc50-cpp

# cert-msc50-cpp

Pseudorandom number generators use mathematical algorithms to produce a sequence of numbers with good statistical properties, but the numbers produced are not genuinely random. The `std::rand()` function takes a seed (number), runs a mathematical operation on it and returns the result. By manipulating the seed the result can be predictable. This check warns for the usage of `std::rand()`.