For Loop:-
for (int i = 0; i < 5; i++) { cout << i << "\n"; }
Example - To Print a Table of numbers from 1 to 10.
While Loop:-
int i = 0; while (i < 5) { cout << i << "\n"; i++; }
Example - To Accept user input until negative number is entered.
Do While Loop:-
int i = 0; do { cout << i << "\n"; i++; } while (i < 5);
Example - To execute the loop body at least once. I.e. start a menu based program to allow users to select a choice.