**Visual Studio Code**

Visual Studio Code (also called VS Code) is one of the most popular free IDEs, published by Microsoft. We can say it is a free version of Visual Studio. It can be used with MinGW Linux Simulation (with GNU C/C++ Compiler) to develop C++ applications running on the command console. It is the most well-known open-source code editor for a wide variety of languages, and it can act as an IDE with the right extensions. This developer-environment tool also offers multiplatform support and is excellent for developers seeking customization and a high degree of flexibility. However, Visual Studio Code is built in Electron and can consumer more resources than other native IDEs.

Prime numbers are interesting area to research. A **prime number**, it is also called **prime** shortly , is a natural number (a positive integer) greater than 1 that is not a product of two smaller natural numbers. If a number is not prime then it is called as a **composed number**. There are several mathematical questions regarding prime numbers are still unsolved. Finding them and relations and their effects on some other functions, graphics really interesting in mathematical phenomena.

**Counting Prime Numbers**

Here is a VS Code example with GCC Compiler to find number of prime numbers in a given range. We are also testing calculation time five times.

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#include <stdio.h> #include <ostream> #include <math.h> #include <time.h> using namespace std; #define max_n 1000000 //--------------------------------------------------------------------------- bool is_prime(unsigned int x) { if(x<=1) return(false); unsigned int q = floor(sqrt((float)x)); for(unsigned int i=2; i<=q; i++) { if((x%i)==0) return(false); } return(true); } //--------------------------------------------------------------------------- int count_primes(unsigned int maxN) { unsigned int res=0; for(int i=2; i<=maxN; i++) { if(is_prime(i)) res++; } return(res); } //--------------------------------------------------------------------------- int main() { unsigned int count; clock_t start,end; for(int k=0; k<5; k++) { start = clock(); count = count_primes(max_n); end = clock(); cout << "Number of primes between 0 to " << max_n << "= " << count << endl; cout << "Elapsed time:" << end-start << " ms" ; } return(0); } |

Here is the screenshot of codes with the outputs from the terminal

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