C++ set empty()C++ empty() function is used to check whether the set container is empty or not. It returns true if the set container is empty (size is 0) otherwise, it returns false. SyntaxParameterNone Return valueIt returns true if the set container is empty (size is 0) otherwise, it returns false. ComplexityConstant. Iterator validityNo changes. Data RacesThe container is accessed. Concurrently accessing the elements of set is safe. Exception SafetyThis function never throws exception. Example 1Let's see the simple example to check if a set contains any element or not: Output: Initially, numbers.empty(): 1 After adding elements, numbers.empty(): 0 In the above example, initially size of set is 0 hence, empty() function returns 1(true) and after adding elements it returns 0(false). Example 2Let's see a simple example to check whether set is empty or not: Output: Set is empty Set is not empty In the above example, if condition statement is used. If set is empty, it will return set is empty after and adding elements, it will return set is not empty. Example 3Let's see a simple example: Output: 100 200 300 In the above example, It simply uses the empty() function in while loop and prints the elements of set until the set is not empty. Example 4Let's see a simple example: Output: Set is empty. Please insert content! Enter three sets of number: 1111 5555 3333 List of telephone numbers: 1111 3333 5555 In the above example, the program first creates phone set interactively with three set of numbers, then it checks if the set is empty or not. If set is empty, it displays a message otherwise, it displays all the telephone numbers available in the set. Next TopicSet size() Function |
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