Goto, Continue, Break and Exit

				
//**************************************
// Name: Goto, Continue, Break and Exit
// Description:Actually, I'm a beginner to C++.
By the moment I'm reading "The C++ Language Tutorial" (www.cplusplus.com) and I'm writting some short sources to understand the lessons.
This one is a simple console source about flow control using labels, GOTO, CONTINUE, BREAK and EXIT. As you probably know GOTO is not recommend to use, but it's part of C++.
Change the system call "clear" to "cls" when running on windows.
// By: Sorrow_Dog
//
//This code is copyrighted and has// limited warranties.Please see http://www.Planet-Source-Code.com/vb/scripts/ShowCode.asp?txtCodeId=13846&lngWId=3//for details.//**************************************

// GOTO, BREAK, CONTINUE and EXIT use sample.
#include <iostream>
#include <string>
#include <sstream>
#include <stdlib.h>
#include <cstdlib>
using namespace std;
int main()
{
 string option;
 int opt = 0, c;
 system("clear");
 // Init Label
 init:
 if (opt == 1)
 {
 system("clear");
 cout << "You have jumped to the beginning with a GOTO.\n";
 cout << "if (opc == 1) goto inicio;\n" << endl;
 }
 cout << "- GOTO order allows to jump to a label." << endl;
 cout << "- CONTINUE order allows to avoid a iteration in a loop." << endl;
 cout << "- BREAK order skips a loop o code block." << endl;
 cout << "- EXIT order stops program execution." << endl << endl;
 cout << "Enter 1 ... To GOTO sample." << endl;
 cout << "Enter 2 ... To CONTINUE sample." << endl;
 cout << "Enter 3 ... To BREAK sample." << endl;
 cout << "Enter 4 ... To EXIT sample." << endl;
 cout << "Option ?:";
 getline(cin, option);
 stringstream(option) >> opt;
 // Selection code using GOTO
 if (opt == 1) goto init;
 if (opt == 2) goto use_continue;
 if (opt == 3) goto use_break;
 if (opt == 4) goto use_exit;
 if ((opt < 0)||(opt > 3)) goto init;
 // CONTINUE label
 use_continue:
 system("clear");
 cout << "We are going to use CONTINUE to avoid 5 to be printed." << endl;
 cout << "for (c=1; c<11; c++)" << endl;
 cout << "{" << endl;
 cout << " cout << c << ',';" << endl;
 cout << " if (c == 5) continue;" << endl;
 cout << "}" << endl;
 
 for (c=1; c<11; c++)
 {
 if (c == 5) continue;
 cout << c << ',';
 }
 cout << endl << endl;
 goto init; // Jump to the beginning
 // BREAK label
 use_break:
 system("clear");
 cout << "We are going to use BREAK to stop a loop." << endl;
 cout << "for (c=1; c<11; c++)" << endl;
 cout << "{" << endl;
 cout << " cout << c << ',';" << endl;
 cout << " if (c == 5) break;" << endl;
 cout << "}" << endl;
 
 for (c=1; c<11; c++)
 {
 cout << c << ',';
 if (c == 5) break;
 }
 cout << endl << endl;
 goto init; // Jump to the beginning
 // EXIT label
 use_exit:
 system("clear");
 cout << "We are stopping the execution with EXIT." << endl;
 cout << "exit(0);" << endl;
 exit(0);
 return(0);
}