Defining variables on the fly, inside for, while, switch statement - C++ Language Basics

C++ examples for Language Basics:Variable

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Description

Defining variables on the fly, inside for, while, switch statement

Demo Code

#include <iostream>
using namespace std;
int main() {/* ww  w.j  av  a2 s  .co  m*/
   { 
       // Begin a new scope
       int q = 0; // C requires definitions here
       // Define at point of use:
       for(int i = 0; i < 100; i++) {
          q++; // q comes from a larger scope
          // Definition at the end of the scope:
          int p = 12;
       }
       int p = 1;  // A different p
    } // End scope containing q & outer p
    cout << "Type characters:" << endl;
    while(char c = cin.get() != 'q') {
       cout << c << " wasn't it" << endl;
       if(char x = c == 'a' || c == 'b')
          cout << "You typed a or b" << endl;
       else
          cout << "You typed " << x << endl;
   }
   cout << "Type A, B, or C" << endl;
   switch(int i = cin.get()) {
      case 'A': cout << "Snap" << endl; break;
      case 'B': cout << "Crackle" << endl; break;
      case 'C': cout << "Pop" << endl; break;
      default: cout << "Not A, B or C!" << endl;
   }
}

Result


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