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Introduction
What is CPP Declarning Variable Type casting Symbolic constants
User-defined Functions
Function prototype Call by Reference Return by Reference Default Arguments
Math Library Functions
ceil(x as float) floor(x as float) fabs(x as float) pow(x as int,y as int) sqrt(x as int) exp(x as int) log(x as float)
Math Library Functions [cont'd]
log10(x as float) sin(x as float) cos(x as float) tan(x as float)
Classes and Objects in CPP
What is Class Structure of Class What is Object
String Class in CPP
append() assign() at() begin() capacity()
Default Arguments in User-defined Functions of Programming in CPP
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Usage 
Default Arguments can be used to pass default values to arguments when values are undefined in main function.
Example
#include <iostream>
using namespace std;

void display(int = 4);

int main()
{
    cout<<"No values passed:\n";
    display();
   
    cout<<"value passed:\n";
    display(5);
  

    return 0;
}

void display(int a){

        cout<<"the value of a"<<a;
    }
    cout<<endl;
}
Output 
No values passed:
The value of a=4

value passed
The value of a=5
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Math Library Functions of Programming in CPP
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User-defined Functions of Programming in CPP
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