C++ multimap operator<C++ Operator< is a non-member overloaded function of multimap. This function is used to check whether the first multimap is less than other or not. Note: Operator < sequentially compares the element of multimap and comparison will stop at first mismatch.SyntaxParameterlhs: First multimap object. rhs: Second multimap object. Return valueIt returns true if the left side of the multimap object is less than the right side of the multimap object otherwise false. ComplexityComplexity will be constant, if the size of lhs and rhs is different. Otherwise, up to linear in the size (equality comparisons). Iterator validityNo changes. Data RacesContainers, lhs and rhs are accessed. Exception SafetyThis function does not throw an exception. Example 1Let's see the simple example to check whether the first multimap is less than or not: Output: Multimap m1 is less than m2. Multimap m1 is not less than m2. In the above example, there are two multimaps m1 and m2. m2 contains one element and m1 is empty. When we compare both multimaps then it will display the message "multimap m1 is less than m2" and after assigning m2 to m1 both multimaps have equal element then it will display the message that "multimap m1 is not less than m2". Example 2Let's see a simple example: Output: The multimap m1 is less than the multimap m2. The multimap m1 is not less than the multimap m3. Example 3Let's see a simple example: Output: 0 1 In the above example if m1 is less than m2 then it will return 1 otherwise 0. Example 4Output: 1). ---------Login---------- Enter the ID and password: 1020 xyz ID and password you have entered: 1020 xyz ID and Password stored in the system: 2040 xyz@123 Incorrect ID or Password... 2). ---------Login---------- Enter the ID and password: 2040 xyz@123 ID and password you have entered: 2040 xyz@123 ID and Password stored in the system: 2040 xyz@123 Welcome to your Page... In the above example, there are two multimaps m1 and m2. m1 contains stored ID and password and second multimap m2 stores user's entered ID and password. It checks whether the m1 is less than m2 or not. If ID and password of m1 is not less than m2 then login is successful otherwise login fails.
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