In C++, keywords are reserved words that have a specific meaning in the language and cannot be used as names for variables, functions, or other objects.
Here is a list of some common C++ keywords:
auto: specifies that a variable's type is determined by the compiler
break: terminates a loop or switch statement
case: specifies a branch of a switch statement
char: declares a character variable
const: declares a constant value that cannot be modified
continue: This keyword is the reason for the next iteration of a loop to begin
default: specifies a default branch of a switch statement
do: begins a do-while loop
double: declares a double-precision floating-point variable
else: specifies an alternative branch of an if statement
enum: declares an enumeration type
extern: This is used to declare a variable or function which is actually defined elsewhere
float: declares a single-precision floating-point variable
for: begins a for loop
goto: transfers control to a labeled statement
if: begins an if statement
int: declares an integer variable
long: declares a long integer variable
register: specifies that a variable should be stored in a register
return: This is used to terminate a function and return a value
short: declares a short integer variable
signed: declares a signed integer variable
size of: determines the size of a variable or data type
static: specifies that a variable or function has static storage duration
struct: declares a structure type
switch: begins a switch statement
typedef: defines a new data type
union: declares a union type
unsigned: declares an unsigned integer variable
void: This specifies that the voice function does not return a value
volatile: specifies that a variable can be modified by other processes
while: begins a while loop
These are just a few examples of C++ keywords. There are many more keywords in the language, and the full list may vary depending on the version of C++ you are using. It is important to familiarize yourself with the keywords in C++, as they have specific meanings and cannot be used as names for variables or other objects.
Here is an example of a simple program written in C++ using some of the keywords I listed
#include <iostream>
using namespace std;
int main() {
int x = 10;
int y = 20;
int z;
z = x + y;
cout << "The sum of x and y is " << z << endl;
return 0;
}
In this program, the "int" keyword is used to declare integer variables "x", "y", and "z". The "using" keyword is used to bring the "cout" object from the "std" namespace into the global namespace. The "cout" object is used to output text to the console, and the "endl" keyword is used to insert a new line. The "return" keyword is used to terminate the main function and return a value to the operating system.
This is just a simple example of how you can use keywords in a C++ program. There are many more keywords in the language, and you can use them to create more complex programs with loops, conditionals, functions, and more.