Prefixing And Postfixing In Increment And Decrement Operators

• Both increment (++) and decrements (--) operator come in two varieties : prefix and postfix. 
• In prefix the increment or decrement operator is written before the variable's name (++a or --a) 
• In postfix the increment or decrement operator is written after the variable's name (a++ or a--).
• Following example given below:-

#include <iostream>
int main ()
{

    using std::cout;
    using std::endl;
    int a = 10;
    a++;
    cout << "The value of a is : " << a << endl;
    ++a;
    cout << "The value of a is : " << a << endl;
    cout << "The value of a is : " << a++ << endl;
    cout << "The value of a is : " << ++a << endl;
    cout << endl;
    int b = 3;
    a = b++;
    cout << "The value of a is : " << a << endl;
    cout << "The value of b is : " << b << endl;
    a = ++b;
    cout << "The value of a is : " << a << endl;
    cout << "The value of b is : " << b << endl;
    return 0;
}