CPP/CommandLineArguments
From ProgrammingExamples
< CPP
CommandLineArgumentsPractical.cpp
#include <iostream> #include <sstream> // Pass this demo program a float and a string, like this: // ./MyProgram 2.3 david int main(int argc, char* argv[]) { // Verify arguments const unsigned int expectedNumberOfArguments = 2; if(argc != expectedNumberOfArguments + 1) // argc is always at least 1 (the program name) { for(int argumentId = 0; argumentId < argc; ++argumentId) { std::cerr << "You have not passed the correct number of arguments! (You passed " << argc - 1 << " but " << expectedNumberOfArguments << " were expected.)" << std::endl; return EXIT_FAILURE; } } // Parse arguments // Add all of the arguments to a stringstream std::stringstream stringStream; for(int argumentId = 1; argumentId < argc; ++argumentId) // start at 1 because this is the first real argument { std::cout << "argument " << argumentId << ": " << argv[argumentId] << std::endl; stringStream << argv[argumentId] << " "; } // Declare the types of the arguments float myFloat; std::string myString; // Convert the arguments as their expected types stringStream >> myFloat >> myString; // Output arguments std::cout << "myFloat: " << myFloat << std::endl << "myString: " << myString << std::endl; return 0; }
CommandLineArgumentsTutorial.cpp
#include <iostream> #include <string> #include <sstream> using namespace std; //test with //24.5 90.3 int main(int argc, char *argv[]) { int NumArgs = argc - 1; cout << "Number of arguments: " << NumArgs << endl; //argv[0] is the EXE name & is always present. string FirstArgument = argv[1]; string SecondArgument = argv[2]; cout << "FirstArgument: " << FirstArgument << endl; cout << "SecondArgument: " << SecondArgument << endl; stringstream ssArg1, ssArg2; ssArg1 << FirstArgument; ssArg2 << SecondArgument; double dArg1, dArg2; ssArg1 >> dArg1; ssArg2 >> dArg2; cout << "FirstArgument: " << dArg1 << endl; cout << "SecondArgument: " << dArg2 << endl; std::string test = argv[1]; cout << "argv[1]: " << argv[1] << endl; cout << "argv[1] string: " << test << endl; return 0; }