Printing Output:
The cout object alongwith insertion operator (<<) is used to print the text on the screen.
Insertion Operator = "<<"Note : cout is pronounced as "see-out".
If you want to print anything on screen you have to write cout, then insertion operator, then your text in double quotation marks in the main function.
output.cpp
#include <iostream>
using namespace std;
int main() {
cout<<"Hi there!";
return 0;
}Note : Do not forget to put ; at the end.
Adding line breaks:
output.cpp
#include <iostream>
using namespace std;
int main() {
cout<<"Hi there!\n";
cout<<"My name is John Smith.";
return 0;
}output.cpp
#include <iostream>
using namespace std;
int main() {
cout<<"Hi there."<<endl;
cout<<"My name is John Smith.";
return 0;
}Different Escape Sequences:
| Escape Sequence | Description | Code |
|---|---|---|
| \n | New line | |
| \t | Tab - prints four spaces | |
| \a | Beep sound | |
| \b | Backspace | |
| \f | Form feed | |
| \r | Carriage return | |
| \\ | It adds backslash | |
| \' | Single quote | |
| \? | Question mark | |
| \0 | Null character | |
Printing Numbers:
If we want to print numbers in C++, we store them in variables then print variables on screen. We will discuss about this in detail in variable section. Here is a brief description.output.cpp
#include <iostream>
using namespace std;
int main() {
num = 10;
cout<<num;
return 0;
}Note : If we write numbers in double quotes, these are not treated as numbers. Everything inside double quotation marks is a string literal which is text. Numbers are outside double qoutes.
Printing Different type of Variables:
If you want to print data stored in a variable, write the name of the variable with cout<< without quotation marks.output.cpp
#include <iostream>
using namespace std;
int main(){
int marks = 90;
string name = "Ali";
char grade = 'A';
float per = 90.8;
cout << "Marks are "<< marks << endl;
cout << "Name is "<< name << endl;
cout << "Grade is "<< grade << endl;
cout << "Percentage is "<< per << endl;
return 0;
}