what is the correct way to handle multiple input command differently in c++?
c++
Solution
Do it like so:
iss >> command;
if (!iss)
cout << "error: can not read command\n";
else if (command == "ADD_STUDENT")
iss >> name >> height >> weight;
else if (command == "ADD_TEACHER")
iss >> name >> height >> weight >> salary;
else if ...
Problem
I have a program that take commands from user and it will process different commands differently. For example: ``` ADD_STUDENT ALEX 5.11 175 ADD_TEACHER MERY 5.4 120 70000 PRINT MERY REMOVE ALEX PRINT TEACHER SALARY PRINTALL ``` therefore, I need to examine each line and see what is the input consists of. Here is my code, but I think I misunderstand the way iss<< work. Can someone give me a suggestion? And tell me how why my code didn't work as I expected? ``` string line; while(getline(cin, line)) { //some initialization of string, float variable std::istringstream iss(line); if(iss >> command >> name >> height >> weight) ..examine the command is correct(ADD_STUDENT) and then do something.. else if(iss >> command >> name >> height >> weight >> salary) ..examine the command is correct(ADD_TEACHER) and then do something... else if(iss >> command >> name) ..examine the command is correct(REMOVE) and then do somethin... } ``` My thought is that the iss>> first >>second >> third will return true if all arguments are filled and false if not enough arguments. But apparently I am wrong.