A C++ wrapper for C standard IO header stdio.h.
The C++ iostream library is an object-oriented library that provides input and output functionality using streams
"For those commenting that cstdio is obsolete personally i like it more than iostream"
from question "Reading hour with scanf() - how to disregard part of input"
"Iostream is said to be slower than cstdio but i suggest you use a profiling tool here to find the best set of options here"
from question "Fastest way to read a text file of strings line by line"
"Yes iostream is slower than cstdio"
from question "Using scanf() in C++ programs is faster than using cin?"