Here is a C++ program to print Hello World on screen. Let's start with a simple C++ program to print "Hello World" string on screen. It become the traditional first program that many people write while learning a new programming language. This program is very useful for beginners to understanding basic syntax of C++ programming language.
C++ Program to Print Hello World
// C++ program to pring hello world string on screen
#include <iostream>
using namespace std;
int main() {
cout << "Hello World";
return 0;
}
Output
Hello World
In above program, we are just print "Hello World" message on screen. Although, a very simple C++ program but very useful in understanding the basic structure of a C++ program. Let us look various parts of the above program line by line:
- // C++ program to pring hello world string on screen
This line is a single-line comment of C++ language. Single-line comments begin with // till end of the line. Everything on the line after // is ignored by compiler. - #include
#include is a preprocessor directive to includes the header file in our program. In this program we are using one such header called iostream which is required for input and output. - using namespace std;
This line tells the compiler to use the std namespace. Namespaces are used to avoid naming conflicts and to make it easier to reference operations included in that namespace. - int main() {
Every C++ program must have only one main() function where program execution starts. The int is what is called the return value of main function. - cout<<"Hello World";
The cout is the standard output stream which prints the "Hello, World!" string on the monitor. - return 0;
It is the Exit status of the program. Returning 0 means informing operating system that program successfully completed, whereas returning 1 means error while running program.
C++ Program to Print Hello World Multiple Times
In this program, we will print "Hello World" string multiple times on screen using a for loop. Don't think much about for loop now, we will discuss about it later.
// C++ program to pring hello world string 10 times
#include <iostream>
using namespace std;
int main() {
int i;
for(i = 0; i < 10; i++){
cout << "Hello World" << endl;
}
return 0;
}
Output
Hello World Hello World Hello World Hello World Hello World Hello World Hello World Hello World Hello World Hello World
Points to Remember
- Every C++ program must have one main() function where program execution starts.
- A single-line comments begin with // till end of the line. Comments are ignored by C++ compilers.
- Every statement of a C++ program must end with a semicolon otherwise compiler will report syntax error while compiling.
- Some header files must be included at the beginning of your C++ program.
- Main returns an exit status to Operating system informing about it's termination state. Whether program executed successfully or an error has occurred.
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