Create a file

Make file

all: one two three

one:
    touch one
two:
    touch two
three:
    touch three

clean:
    rm -f one two three

Source: makefiletutorial.com

Create a file

#include <fstream>

int main() {
  std::ofstream output("example.txt");
  output << "The answer to life, the universe, and everything is ";
  output << 42;
}

Source: cppbyexample.com

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