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1. Output Using cout<\/strong><\/h4>\r\nYou use cout to display formatted output to the standart output device such as the monitor screen. Cout is an instance of the ostream class. Therefore, you need to include <iostream>. You use cout along with the stream insertion operator <<. Let’s take a simple example.<\/p>\r\n
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#include <iostream><\/span>\r\nusing<\/span> namespace<\/span> std;\r\n\r\nint<\/span> main<\/span>() {\r\n\tcout <<<\/span> \"Welcome to C++!\"<\/span>;\r\n\treturn<\/span> 0<\/span>;\r\n}\r\n<\/pre>\r\nThe above code uses cout to display the message ‘Welcome to C++!’ to the screen.<\/p>\r\n
The <iostream> file contains defintion for the following objects<\/p>\r\n
\r\n- cin – standard input stream<\/li>\r\n
- cout – standard output stream<\/li>\r\n
- cerr – unbuffered error stream<\/li>\r\n
- clog – buffered error stream<\/li>\r\n<\/ul>\r\n
\u00a0<\/h4>\r\n2. Input Using cin<\/strong><\/h4>\r\n\r\nThe cin object is an instance of the istream class and is used to read user input from standard input, for instance, the keyboard. You use it with the stream extraction operator >>. The code below prompts the user for his name. The it gets his name as input and displays a greeting using the name input.<\/p>\r\n\r\n
#include <iostream><\/span>\r\nusing<\/span> namespace<\/span> std;\r\n\r\nint<\/span> main<\/span>() {\r\n\tstring name;\r\n\tcout <<<\/span> \"Please enter your name: \"<\/span>;\r\n\tcin >><\/span> name;\r\n\tcout <<<\/span> \"Good day, \"<\/span> +<\/span> name;\r\n\treturn<\/span> 0<\/span>;\r\n}\r\n<\/pre>\r\nThe output is shown below:<\/p>\r\n
The above code uses cout to display the message ‘Welcome to C++!’ to the screen.<\/p>\r\n
The <iostream> file contains defintion for the following objects<\/p>\r\n
- \r\n
- cin – standard input stream<\/li>\r\n
- cout – standard output stream<\/li>\r\n
- cerr – unbuffered error stream<\/li>\r\n
- clog – buffered error stream<\/li>\r\n<\/ul>\r\n
\u00a0<\/h4>\r\n
2. Input Using cin<\/strong><\/h4>\r\n\r\n
The cin object is an instance of the istream class and is used to read user input from standard input, for instance, the keyboard. You use it with the stream extraction operator >>. The code below prompts the user for his name. The it gets his name as input and displays a greeting using the name input.<\/p>\r\n\r\n
#include <iostream><\/span>\r\nusing<\/span> namespace<\/span> std;\r\n\r\nint<\/span> main<\/span>() {\r\n\tstring name;\r\n\tcout <<<\/span> \"Please enter your name: \"<\/span>;\r\n\tcin >><\/span> name;\r\n\tcout <<<\/span> \"Good day, \"<\/span> +<\/span> name;\r\n\treturn<\/span> 0<\/span>;\r\n}\r\n<\/pre>\r\nThe output is shown below:<\/p>\r\n
![\"C++](\"https:\/\/www.kindsonthegenius.com\/cplusplus\/wp-content\/uploads\/sites\/17\/2020\/08\/C-Input-and-Output.jpg\")
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