Programming Articles - Page 2737 of 3366

Here we will see how to map enum type data to a string in C++ There is no such direct function to do so. But we can create our own function to convert enum to string. We shall create a function that takes an enum value as the argument, and we manually return the enum names as a string from that function. First of all, let us understand what is an enum in C++. What is an Enum in C++? Enum is a user-defined datatype in C++ that is used to assign names to integer values. For example, you ... Read More

The STL library in C++ provides various inbuilt functions and methods to manipulate strings, such as converting them to lower case or upper case. In this article, we will learn all the approaches to convert a std::string to lower case in C++. First of all, let's understand the problem statement. In this problem, you are given a string as input and you need to convert it to lower case. The string may contain any type of characters such as letters, digits, and special characters. For example: // Input String std::string str = "Hello World! 123 @ TutorialsPoint"; // ... Read More

A. The SQL DROP TABLE statement is used to remove a table definition and all the data, indexes, triggers, constraints and permission specifications for that table.SyntaxDROP TABLE table_name;To drop an table from a database using JDBC API you need to:Register the driver: Register the driver class using the registerDriver() method of the DriverManager class. Pass the driver class name to it, as parameter.Establish a connection: Connect ot the database using the getConnection() method of the DriverManager class. Passing URL (String), username (String), password (String) as parameters to it.Create Statement: Create a Statement object using the createStatement() method of the Connection interface.Execute the Query: Execute ... Read More

Enum is a user-defined datatype in C++ that is used to assign names to integer values. For example, you can use an enum to represent the days of the week from 0 to 6, where 0 represents Sunday, 1 represents Monday, and so on. When you try to access a value of an enum, it will only return an integer value. In this article, we will learn how to convert an enum type variable to a string type variable in C++, so that we can easily display the enum value as a string. Example of Enum: enum color ... Read More

In this section, we will see how to convert C++ string (std::string) to const char* or char*. These formats are C style strings. We have a function called c_str(). This will help us to do the task. It returns a pointer to an array that contains a null-terminated sequence of characters (i.e., a C-string) representing the current value of the string object.Following is the declaration for std::string::c_str.const char* c_str() const;This function returns a pointer to an array that contains a null-terminated sequence of characters (i.e., a C-string) representing the current value of the string object. If an exception is thrown, ... Read More

A. You can create a table in a database using the CREATE TABLE query.SyntaxCREATE TABLE table_name( column1 datatype, column2 datatype, column3 datatype, ..... columnN datatype, PRIMARY KEY( one or more columns ) );To create a table in a database using JDBC API you need to:Register the driver: Register the driver class using the registerDriver() method of the DriverManager class. Pass the driver class name to it, as parameter.Establish a connection: Connect ot the database using the getConnection() method of the DriverManager class. Passing URL (String), username (String), password (String) as parameters to it.Create Statement: Create a Statement object using the createStatement() ... Read More

In C++ we can compare two strings using compare() function and the == operator. Then the question is why there are two different methods? Is there any difference or not? Yes, there are some basic differences between compare() and == operator. In C++ the == operator is overloaded for the string to check whether both strings are same or not. If they are the same this will return 1, otherwise 0. So it is like Boolean type function. The compare() function returns two different things. If both are equal, it will return 0, If the mismatch is ... Read More

A. You can drop/delete a database using the DROP DATABASE query.SyntaxDROP DATABASE DatabaseName;To drop a Database using JDBC API you need to:Register the driver: Register the driver class using the registerDriver() method of the DriverManager class. Pass the driver class name to it, as parameter.Establish a connection: Connect ot the database using the getConnection() method of the DriverManager class. Passing URL (String), username (String), password (String) as parameters to it.Create Statement: Create a Statement object using the createStatement() method of the Connection interface.Execute the Query: Execute the query using the execute() method of the Statement interface.ExampleThe show databases command gives ... Read More

In C++, char[] represents a character array, while string is a class in STL to manage text data. Both string and char[] can be used to store and process text data. But, they are different in terms of structure, usage, memory management, and capabilities. In this article, we will discuss the difference between string and char[] types in C++. char[] in C++ char[] is an array of characters that is used to store a string. It is a C-style string representation. The size of char array will be fixed. At the end of the array, a null character '\0' ... Read More

In C++, we can create vectors easily using the standard library. We are taking the main string and the string that will be searched as a vector, then searching it into the main string. When one match is found the function returns the address, and removes it from the main string. So in the next iteration, it starts from location 0 and searches again. For multiple occurrences, we are using loops and repeatedly searching for the match, and return the position. Input: Main String: "ABCcdABCcdABC" Substring to search: "cd" Output: Match found at Position = 1 Match found at ... Read More