int menuinput(void)
{
std::string pingv;
std::string input2;
std::string drive;
drive = "c";
std::cout << "C:\>" ;
cin >> input2 ;
std::transform(input2.begin(), input2.end(), input2.begin(), (int(*)(int))std::toupper);
//if( strnicmp( input2.c_str(), "fdisk", 10 ) == 0 )
if (input2 == "FDISK")
{
FDISK();
}
if (input2 == "DEBUG")
{
debug();
}
if (input2 == "FORMAT")
{
// can not put in a drive letter yet
// need to define drive letter as a string constant
std::cout << "The type of file system is NTFS."<< std::endl << std::endl;
FORMAT();
}
if (input2 == "HELP")
{
help();
}
if (input2 == "PING")
{
std::cin >> pingv;
std::cout << "pinging " << pingv << std::endl;
ping();
}
if (input2 == "ipconfig")
{
ipconfig();
}
if (input2 == "EXIT")
{
std::cout << "CLOSING SIMULATION" << std::endl;
exit (1);
}
if (input2 == "TIME")
{
ttime();
}
if (input2 == "DATE")
{
ttime();
}
/*
if (input2 == "sample")
{
externalpro();
}
if (input2 == "DIR")
{
int dir();
}
*/
if (input2 == "CLS")
{
system("cls");
menuinput();
}
if (input2 == "DOS")
{
doscom();
}
else
{
std::cout <<" NOT A VALID COMMAND:"<<std::endl;
menuinput();
}
return 0;
}
prossesing string input in c++
Author
I am trying make a function that will take a bunch of key strings.
example
Is there is better way to do this?
I need to keep adding in input strings and I dont want to make it any bigger.
Thanks
I dont think there is an overall better solution but there is one thing I can definately help out with with that I'm sure you'll be glad about.
Instead of going ...
if then
if then
if then
use a SWITCH control structure.
These should get you going:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccelng/htm/statem_10.asp
http://courses.cs.vt.edu/~cs3304/Spring00/notes/Chapter-7/tsld017.htm
http://www.ictp.trieste.it/texi/gpp/gpp_36.html
Instead of going ...
if then
if then
if then
use a SWITCH control structure.
These should get you going:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccelng/htm/statem_10.asp
http://courses.cs.vt.edu/~cs3304/Spring00/notes/Chapter-7/tsld017.htm
http://www.ictp.trieste.it/texi/gpp/gpp_36.html
Switch's only work with singular constants, not arrays (like strings) so you'll have to use if statements.
However if it were my project I'd create a structure containing a name & prehaps a function pointer, then make a global array of those.
Do a quick search through & compare each name when a command is entered rather than typing all searches by hand
However if it were my project I'd create a structure containing a name & prehaps a function pointer, then make a global array of those.
Do a quick search through & compare each name when a command is entered rather than typing all searches by hand
Re xyuri: I think the C++ switch statement only allows simple constants (e.g. char or int) in the case expression.
How about mapping strings to function pointers? Here is an example of the idea:
How about mapping strings to function pointers? Here is an example of the idea:
typedef map<string, void (*)()> CmdMap;void bye() { cout << "Bye\n"; exit(0); }void hello() { cout << "Hello\n"; }void world() { cout << "World\n"; }int main(int argc, char** argv) { CmdMap cmdMap; cmdMap["HELLO"] = hello; cmdMap["WORLD"] = world; cmdMap["BYE"] = bye; string cmd; while (cin >> cmd) { transform(cmd.begin(), cmd.end(), cmd.begin(), toupper); if (cmdMap.find(cmd) != cmdMap.end()) { cmdMap[cmd](); } else { cerr << "Unknown command: " << cmd << '\n'; return 1; } } return 0;}Quote:Original post by xyuri
I dont think there is an overall better solution but there is one thing I can definately help out with with that I'm sure you'll be glad about.
Instead of going ...
if then
if then
if then
use a SWITCH control structure.
Which, however, only works for integral data types, not for strings.
Quote:Original post by MiserableQuote:Original post by xyuri
I dont think there is an overall better solution but there is one thing I can definately help out with with that I'm sure you'll be glad about.
Instead of going ...
if then
if then
if then
use a SWITCH control structure.
Which, however, only works for integral data types, not for strings.
Then why in this example is it being used for strings?
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/vccelng/htm/statem_10.asp
EDIT:
nevermind, I see the light now :)
I recommend making a tokenizer.
example(ugly, but it should get the idea across):
EDIT: fixed a bug in the example
[Edited by - Roboguy on October 22, 2004 1:54:43 AM]
example(ugly, but it should get the idea across):
class Tokenizer { std::deque<std::string> tokens; int index;public: Tokenizer(std::string str) { for (int i = 0; i < str.length(); i++) { if (str != ' ') { tokens[index][tokens[index].length()] = str; } else { index++; } } index = 0; } std::string nextToken() { index++; return tokens[index-1]; } void setIndex(int index) { this.index = index; }};EDIT: fixed a bug in the example
[Edited by - Roboguy on October 22, 2004 1:54:43 AM]
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