1.5K
Here is the simplest C++ program that will print the string, Hello World, on the output. This is the first program told to a newbie while introducing them to programming language.
Let’s have a look at the program given below:
C++ “Hello World!” Program
// Simple C++ "Hello World" Program
#include <iostream>
using namespace std;
int main() {
std::cout << "Hello World!"<<endl;
return 0;
}Output
Hello World!
- In C++, any line starting with
//is a comment. Comments are intended for the person reading the code to better understand the functionality of the program. It is completely ignored by the C++ compiler. - The iostream is a header file, stands for input/output stream, provides basic input/output services for the C++ program. Like in the above program, cout is used to put some content on the output screen. It is defined in iostream header file.
- The following C++ statement:
using namespace std;
is used to provide standard (std) input/output namespace. That is, after including this statement, we do not need to write std:: before every cout and cin
- The endl stands for end of line, used to break the line and start next thing from new line.
- The
return 0;statement is the “Exit status” of the program. In simple terms, the program ends with this statement. - The execution of code begins from the
main()function. This function is mandatory. This is a valid C++ program that does nothing.
