Repetition

In C language, there are three repetition or looping operation:

• for
• while
• do-while

1. FOR

Syntax:

for ([initialization] ; [condition] ; [counter])

{

statement(s);

}

Note:

# condition : the condition to keep going or to stop

e.g.: i < 10 , meaning that when i is no longer less than ten, it will not continue and go out from the operation

# counter : it can be increment, decrement or also any addition or subtraction of a variable

e.g.: i++ or ++i , both are the same meaning in this operation ; i+=2 , meaning i will be increased by two for every end of the operation

# [...] means it can be either filled or not

The sequence of for operation:

1. Initialization
2. Condition - if the condition false, directly exit the operation
3. Statement(s)
4. Counter
5. Return to the beginning

# Infinite Loop: there are no stop condition
# Nested Loop: for inside for

Example:

2. WHILE

Syntax:
while( <boolean expression> )
{
statement(s);

}

Note:
# boolean expression: expression that only have true or false value

The sequence of while operation:

1. Boolean expression - if false then directly exit the operation
2. Statement(s)
3. Return to beginning

Example:

3. DO-WHILE

Syntax:
do
{
statement(s);
}

while ( <boolean expression> );

The sequence of do-while operation:

1. Statement(s)
2. Boolean expression - if false directly exit the operation
3. Return to the beginning

Example: