How Does the Ternary Operator (?:) Work in C ?

Understanding the Question Mark Operator in C

In C , the question mark character (?') has a special meaning known as the conditional operator. When used in code, it allows for concise conditional statements.

What it Means

The conditional operator, when used in the form:

condition ? result_if_true : result_if_false

evaluates to the value of result_if_true if the condition is true, and the value of result_if_false otherwise.

Example

Consider the following code snippet:

int qempty()
{
    return (f == r ? 1 : 0);
}

Here, the condition (f == r) evaluates to either true or false. If it's true, the code returns 1; otherwise, it returns 0.

Alternative Syntax

The conditional operator can be replaced with a more verbose if-else statement:

int qempty()
{ 
  if(f == r)
  {
      return 1;
  } 
  else 
  {
      return 0;
  }
}

Additional Note

Some refer to the conditional operator as "the ternary operator" because it is the only operator in C that takes three arguments.

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