C++ PROGRAM

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In this entry, we would like to share on the C++ program.  According to wikipedia, C++ is a general purpose programming language. Basically there are 6 basic elements in this program:

1.  Simple C++ program

• The simple C++ program is can be done at 👉 click here and then choose C++ in the language search
• The format and example is:

1 // Writing my age 

👉 1st line is called comment line that describe the purpose of the program

👉 Must begin with //

2 

3 #include <iostream>

👉 Is the processor directive

👉 Must begin with #

👉 <iostream> is the library of function, symbols and operators

4 using namespace std; 

👉 To give instruction to the compiler to use function in standard library.

5 

6 int main() 

👉 The main function of the program

7 { 

👉 Code starts { 

8 int age; // input - age 

9 

10 // Get data on age 

11 cout << "Enter your age => ";

👉 An interactive message which the program asking for data from the user as input data is called a prompt

12 cin >> age;

👉 The variable name has to be defined earlier

13 

14 //Display message 

15 cout << "I am " << age << " years old" << endl; 

👉 endl is used to terminate a line of output and starts a new one

16 return 0; 

👉 indicates that the program has ran normally

17 } 

👉 ends of the code

• the coding is as shown below:

• The input will be:

Enter your age =>  19
I am 19 years old
  

      2. Data Types

• Numbers

- Floating point numbers

   👉 Numbers with fractional part or decimal place

- Integers

   👉 Exact numbers without decimal place

• Characters

- Store single characters 

- Written as char

- The characters is enclosed in single quotes

• Strings

- Double quotes is used to enclose a string’s value 

      3. Arithmetic expression

• Multiple operators

- Parentheses of complex sub-expression. eg:

p / –q + ( r – s + t ) * n => ( p / (-q) ) + ( ( r – s + t ) * n )

 

• Operators / and % 

- Calculate the integer quotient (/) & remainder (%)

• Rounding

- If you want to round a positive value of the float to the nearest integer, add 0.5 before explicitly converting to an int to avoid loss of the value’s fractional part

      4. Additional Operators

- Besides, + - * / , C++ program also can provides predefined units called functions for operators 

- The list of names and descriptions of some of the most commonly used functions are as shown below:

Well, that's all  what we had learnt in the past class. Till then, thank you guys for constantly reading our blog!💋😘