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Auto is a keyword in C++11 and later that is used for automatic type deduction. Type inference or deduction refers to the automatic detection of the data type of an expression in a programming language. It is a feature present in some strongly statically typed languages. For example, you want to create an iterator to iterate over a vector, you can simply use auto for that purpose. example#include #include using namespace std; int main() { vector arr(10); for(auto it = arr.begin(); it != arr.end(); it ++) { cin >> *it; } return 0; }In ... Read More
You can initialize a variable using the assignment operator or use its constructor when initializing it. For example,int i = 0; MyClass instance(1, "Hello");It will be automatically initialized ifIt's a class/struct instance in which the default constructor initializes all primitive types; like MyClass instance; You use array initializer syntax, e.g. int a[10] = {} (all zeroed) or int a[10] = {1,2}; (all zeroed except the first two items: a[0] == 1 and a[1] == 2) It is a global/extern variable It is defined static
If you have statements like −Class Person;This is a forward declaration. It lets the following code know that there is are classes with the name Person. This satisfies the compiler when it sees these names used. Later the linker will find the definition of the classes.
Yes, we can declare the main method as private in Java.It compiles successfully without any errors but at the runtime, it says that the main method is not public.Example:class PrivateMainMethod { private static void main(String args[]){ System.out.println("Welcome to Tutorials Point"); } }The above code is working successfully at compile time but it will throw an error at the runtime.Output:Error: Main method not found in class PrivateMainMethod, please define the main method as: public static void main(String[] args) or a JavaFX application class must extend javafx.application.Application
An enumerated type declares an optional type name and a set of zero or more identifiers that can be used as values of the type. Each enumerator is a constant whose type is the enumeration. For example, if you are creating an application that has a fixed number of types for some variable. For example, let's say gender, it can be of three types male, female and others. You can define and use an enum like −#include using namespace std; enum Gender {MALE, FEMALE, OTHERS}; int main() { Gender gen = Gender.FEMALE; return 0; }By default, the value ... Read More
The equality operators in C++ are is equal to(==) and is not equal to(!=). They do the task as they are named. The binary equality operators compare their operands for strict equality or inequality. The equality operators, equal to (==) and not equal to (!=), have lower precedence than the relational operators, but they behave similarly. The result type for these operators is bool.The equal-to operator (==) returns true (1) if both operands have the same value; otherwise, it returns false (0). The not-equal-to operator (!=) returns true if the operands do not have the same value; otherwise, it returns ... Read More
In the prefix version (i.e., ++i), the value of i is incremented, and the value of the expression is the new value of i. So basically it first increments then assigns a value to the expression. In the postfix version (i.e., i++), the value of i is incremented, however, the {value|the worth} of the expression is that the original value of i. So basically it first assigns a value to expression and then increments the variable.Let's look at some code to get a better understanding −Example#include using namespace std; int main() { int x = 3, y, z; ... Read More
An enumerated type declares an optional type name and a set of zero or more identifiers that can be used as values of the type. Each enumerator is a constant whose type is the enumeration. For example, if you are creating an application that has a fixed number of types for some variable. For example, let's say gender, it can be of three types male, female and others. You can define and use an enum like −#include using namespace std; enum Gender {MALE, FEMALE, OTHERS}; int main() { Gender gen = Gender.FEMALE; return 0; }By default, the value ... Read More
There are two ways to set the path in java, First is Temporary Path and second is Permanent Path.Setting Temporary PathOpen command prompt in WindowsCopy the path of jdk/bin directory where java located (C:\Program Files\Java\jdk_version\bin)Write in the command prompt: SET PATH=C:\Program Files\Java\jdk_version\bin and hit enter command.Setting Permanent PathGo to My Computer ---> Right Click on it ---> Advanced System Settings ---> Advanced Tab ---> Click on Environment VariablesClick on New tab of User variables, assign value JAVA_HOME to Variable Namejava\jdk_version\bin path (copied path) to Variable Value and click on OK ButtonFinally, click on OK button.Read More
The multiplicative operators are −Multiplication (*)Division (/)Modulus or “remainder from division” (%)These binary operators have left-to-right associativity. The multiplicative operators take operands of arithmetic sorts. The modulus operator (%) contains a stricter requirement in this its operands should be of integral type.The multiplication operator yields the result of multiplying the first operand by the second.The division operator yields the result of dividing the first operand by the second.The modulus operator yields the remainder given by the subsequent expression, wherever e1 is that the 1st operand and e2 is that the second: e1 – (e1 / e2) * e2, where both ... Read More