how to "go back" in code

[BinaryDonuts]

string command;
int main(){
cin >> command;
if (command == "exit"){
//code that exits the program
}
else{
cout << "Unknown command '"<<command<<"' try again";
cin >> command;
}
}

if the command entered is not exit the program asks for another command but when the next command is wrong the program closes how would i make it so that the programm keeps asking for valid comands?

[LB]

You want to use a looping structure:

std::string command;
while((std::cout << "Enter command: ") && std::getline(std::cin, command))
{
    if(command == "exit")
    {
        break;
    }
    else if(command == "blah")
    {
        std::cout << "Blah blah blah." << std::endl;
    }
    else
    {
        std::cout << "Unknown command." << std::endl;
    }
}

http://www.cplusplus.com/doc/tutorial/control/#loops

[BinaryDonuts]

Thanks that helped alot.

[BinaryDonuts]

What if i want the command to ask for parameters?

[LB]

LB wrote:

You can easily split by spaces:

std::string command;
while((std::cout << "Enter command: ") && std::getline(std::cin, command))
{
    std::vector<std::string> v; //will hold the command name and its arguments
    std::istringstream iss (command); //used for splitting by space
    while(iss >> command) //keep looping until we run out of arguments
    {
        v.push_back(command); //add each part of the command to the vector
    }
    if(v.size() < 1) //make sure the command wasn't empty
    {
        continue;
    }
    else if(v.front() == "exit")
    {
        break;
    }
    else if(v.front() == "blah" && v.size() == 2)
    {
        std::cout << "Blah blah blah: " << v[1] << std::endl;
    }
    else
    {
        std::cout << "Unknown command." << std::endl;
    }
}