Iteration Constructs

The For Loop

Source Code :

// Program Description:

// A Program that uses for iteration construct to print a series

#include<iostream.h>

#include<conio.h>

void main()

{

// cleaning the screen

clrscr();

// declaration of variables

int ctr;

// for loop starts here

for(ctr=0;ctr<=10;ctr++)

{

cout<<endl<<"\t"<<ctr;

}// for loop ends here

// waiting for the user to analyse the output

cout<<endl<<endl<<"\tPress any key to quit...";

getch();

}// main ends here

Program Flow :

• A counter variable is created in the memory. This variable's value acts as the termination statement for the loop.
• The Looping Statement is encountered by the compiler. In this statement the compiler checks for the counter variable's initial value to enter the loop.
• If the Loop Condition is fulfilled by the counter variable the block of code which is placed inside the curly braces gets executed.
• The Loop then comes back to the Conditional Statement and checks whether the counter variable's value still fulfills a certain criteria.
• If the value of counter still fulfills the condition the Loop is executed again.
• This process continues until the Counter's value fulfills the condition.
• The Compiler exits the Loop and waits for the user to press a key to exit.

Output Screenshots :