Basic Control Flow

The `if/else` Statement

The if/else consists of a condition of two alternatives.
- The first condition is performed is the condition is true.
- The second condition is performed if the condition is false.
```
if (area >= 0)
   cout << "The side length is " << sqrt(area) << "\n";
else
   cout << "Error: Negative area.\n";
```

The if/else statement is a better choice than a pair of if statements with complementary conditions.

if (area >= 0) /* complementary conditions */
   cout << "The side length is " << sqrt(area) << "\n";
if (area < 0) /* complementary conditions */
   cout << "Error: Negative area.\n";

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The if/else Statement

The `if/else` Statement