C++

hello world

• g++ -Wall hello.cpp -o hello
  • if no -o specified, you get a.out
  • -Wall = include extra warnings specific to C++

General

• Copy one file into another:

#include <fstream>
#include <string>

int main(){
     
     //Open file for reading
     std::ifstream in("input.dat");
     
     //Open file for writing
     std::ofstream out("output.dat");
     
     //Temporary buffer for line read from file
     std::string line;
     
     while(getline(in,line)){//getline removes the newline char
          out<<line<<'\n';   // Appending back newline char  
     }
     return 0;
}

stdlib functions

• strchr() vs strrchr() - returns pointer to first and last instance of a specified character, respectively.