Prime Number Finder - C/C++ Version

Prime Numbers Finder using the Sieve of Eratosthenes

User gives a natural number (positive integer) N from the standard input and the program writes 2 lines: It calculates all the prime numbers up to N in one line, and in the last line, it writes how many they are.

This is the C/C++ Version. I think it compiles both in C and C++.

I recommend GCC or G++ as a compiler. Personally I compiled it like this:

g++ sieve.cpp -O3 -o sieve

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Prime Number Finder - C/C++ Version
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