C++ syllabus (BCA 2nd Semester)



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Learning C++ Part One Example

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C++ Syntax Example #include <iostream> using namespace std; int main() {   cout << "Hello World!";   return 0; } Example explained Line 1 : #include <iostream> is a header file library that lets us work with input and output objects, such as cout (used in line 5). Header files add functionality to C++ programs. Line 2 : using namespace std means that we can use names for objects and variables from the standard library. Line 3 : A blank line. C++ ignores white space. But we use it to make the code more readable. Line 4 : Another thing that always appear in a C++ program, is int main(). This is called a function. Any code inside its curly brackets {} will be executed. Line 5 : cout (pronounced "see-out") is an object used together with the insertion operator (<<) to output/print text. In our example it will output "Hello World!". Note : Every C++ statement ends with a semicolon;. Note : The body of int main() could also been written a...
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Learning C++ Part 2 Example

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C++ Functions A function is a block of code which only runs when it is called. You can pass data, known as parameters, into a function. Functions are used to perform certain actions, and they are important for reusing code: Define the code once, and use it many times. Create a Function C++ provides some pre-defined functions, such as main(), which is used to execute code. But you can also create your own functions to perform certain actions. To create (often referred to as declare) a function, specify the name of the function, followed by parentheses (): Syntax void myFunction() {   // code to be executed } Example Explained myFunction() is the name of the function void means that the function does not have a return value. You will learn more about return values later in the next chapter inside the function (the body), add code that defines what the function should do Call a Function Declared functions are not executed immediately. They are "saved for later use", and will be ...
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