Program Control: Repetition

Program Control: Repetition

Sub Topics :

Program Control - Repetition:

–Repetition Definition

–For

–While

–Do-While

–Repetition Operation

–Break vs Continue

Repetition Definition

One or more instruction repeated for certain amount of time. Number of repetition can be predefined (hard

-coded in program) or defined later at run time

Repetition/looping operation:
–for
–while
–do-while

For

Syntax:

for(exp1; exp2; exp3) statement;

or:

for(exp1; exp2; exp3){

statement1;

statement2;

…….

}

exp1 :  initialization

exp2 :  conditional

exp3 :  increment or decrement

exp1, exp2 and exp3 are optional

While

Syntax :

while (exp) statements;

or:

while(exp){

statement1;

statement2;

…..

}

Do-While

Syntax :

do{

< statements >;

} while(exp);

Keep executing while exp is true

exp evaluation done after executing the statement(s)

Repetition Operation

In while operation, statement block of statements may never be executed at all if exp value is false

In do-while on the other hand statement block of statements will be executed min once

To end the repetition, can be done through several ways:

-Sentinel

-Question, should the repetition continue?

Break vs Continue

break:

–ending loop (for, while and do-while)

–end the switch operation

continue:

skip all the rest of statements (subsequent to the skip statement) inside a repetition, and continue normally to the next loop

Summary

Repetition is a condition which is one or more instruction repeated for certain amount of time

3 types of repetition/looping in C:

-for

-do while

-while

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Skyconnectiva
Kevin Orlando Sutanto