Getting Started

Chapter 5: C Control Flow

statement). Th
K&R) ember to use it when you add a
stateme

Loops – While, For and Do-while.................................................................

// Do stuff while expression is true

The co

oop_ (3000 );

This do p in our first example program:

{

PORTD = i;

}

e break after default: isn’t even necessary, but is recommended (by

as a good practice to help you rem

nt to the end of the list.

We’ve been using while for a while (har!).

while(expression)

{

}

While will repeat the associated statement or block as long as the expression is
true.

de fragment:

xint i;

while( i <= 1

{

PORTD = i;

_delay_l 2 0

i = i*2;

}

es exactly the same thing as the for loo

for(int i = 1; i <= 128; i = i*2)

_delay_loop_2(30000);

}

The for loop is constructed as follows:

for(expresson1; expression2; expresson3)
{
// Do stuff