C++ Tutorial/Operators statements/break

Break a for loop

<source lang="cpp">#include <iostream> using namespace std;

int main() {

 int t; 

 // Loops from 0 to 9, not to 100! 
 for(t=0; t<100; t++) { 
   if(t==10) break; 
   cout << t << " "; 
 } 

 return 0; 

}</source>

0 1 2 3 4 5 6 7 8 9

Break an infinite loop

<source lang="cpp">#include <iostream> using namespace std;

int main() {

 int t, count;  

 for(t=0; t<10; t++) { 
   count = 1; 
   for(;;) { 
     cout << count << " "; 
     count++; 
     if(count==10) break; 
   }  
   cout << "\n"; 
 } 

 return 0; 

}</source>

1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9

Break from while

<source lang="cpp">#include<iostream.h> int main() {

 int x,y,s;
 cin >> x >> y;
 s=0;
 while(1)
 {
   if(s==0)break;
   s +=x;
 }
 cout<<s<<endl;

}</source>

1
2
2

Demonstrating a Forever Loop

<source lang="cpp">#include <iostream> int menu(); void DoTaskOne(); void DoTaskMany(int); using namespace std; int main() {

  bool exit = false;
  for (;;)
  {
     int choice = menu();
     switch(choice)
     {
       case (1):
           DoTaskOne();
           break;
       case (2):
           DoTaskMany(2);
           break;
       case (3):
           DoTaskMany(3);
           break;
       case (4):
           continue;  
           break;
       case (5):
           exit=true;
           break;
       default:
           cout << "Please select again! " << endl;
           break;
     }             
     if (exit == true)
        break;
  }                
  return 0;

} int menu() {

  int choice;
  cout << " **** Menu **** "   << endl << endl;
  cout << "(1) Choice one. "   << endl;
  cout << "(2) Choice two. "   << endl;
  cout << "(3) Choice three. " << endl;
  cout << "(4) Redisplay menu. " << endl;
  cout << "(5) Quit. "    << endl << endl;
  cout << ": ";
  cin >> choice;
  return choice;

} void DoTaskOne() {

  cout << "Task One! " << endl;

} void DoTaskMany(int which) {

  if (which == 2)
     cout << "Task Two! " << endl;
  else
     cout << "Task Three! " << endl;

}</source>