// // Program to test "is_even" function. // #include  using namespace std; void is_even(int); // Function Prototype int main( ) { int num; cout << "Enter an integer: "; cin >> num; cout << "Is " << num << " even? "; is_even(num); cout << endl; return 0; } // "is_even" function. // Prints "yes" if a is even, "no" otherwise. void is_even(int a) { // insert code here to complete the function // use if else structure } 

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The purpose of this program is to practice using user defined functions.

Add code to the program to complete it.

Compile and run this C++ program.