C++ Tutorial/Operators statements/Comma operator

Comma operator

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

int main() {

 int i, j; 

 j = 10; 

 i = (j++, j+100, 999+j); 

 cout << i; 

 return 0; 

}</source>

1010

Demonstrating the comma operator

<source lang="cpp">#include <iostream>

1. include <iomanip>

using std::cout; using std::cin; using std::endl; using std::setw; int main() {

 int count = 10;
 for(long n = 1, sum = 0, factorial = 1;sum += n, factorial *= n, n <= count ;
n++)
   cout << setw(4) << n   << "    "
        << setw(7) << sum << " "
        << setw(15) << factorial
        << endl;
 return 0;

}</source>

1          1               1
   2          3               2
   3          6               6
   4         10              24
   5         15             120
   6         21             720
   7         28            5040
   8         36           40320
   9         45          362880
  10         55         3628800

The Comma Operator: The value of a series of expressions is the value of the right most

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

  long num1 = 0, num2 = 0, num3 = 0, num4 = 0;
  num4 = (num1 = 10, num2 = 20, num3 = 30);
  cout << num4;
  cout << endl;
  return 0;

}</source>