Basic concepts of C++ programming

Intro to C++

  • C++ is a complied language its means it will convert into machine code before its runs
  • memory management should be done manually (dynamic memory must be allocated and destroyed manually)

Printing a value in the screen

  • this can be done in two separate ways
    • using printf or cout

printf("hello samith");

std:: cout << "hello samith" << std::endl;

Inputs and outputs in C++

  • inputs can get through via terminal using following command. but you need to import #include <iostream> for that
int a; 
std:: cin >> a;
  • output can get through using follows
std:: cout << a << std::endl

Basic data types

char - characters long - used to record 64 bit integer float - record 32 bit of real value double - record 64 bit of real value

  • fixed used with float to print specify amount of digits that tell by the setprecision() this is explained clearly in the below example
double j;
std:: cout << std::fixed << std::setprecision(3) << j << '\n';

Conditional statements

for loop
for(<expression1> ; <expression2> ; <expression3>) {
  • expression 1 - initialising the flag variables that generally used for controlling and terminating the loop

  • expression 2 - used to checked the terminating condition

  • expression 3 - generally used to update the flag variables

  • example :

for(int i = 0; i < 10; i++) {


  • syntax of a function
return_type function_name (arg1_type arg_1, arg2_type arg_2){

return value;