What is the Loops? The types of loops? Descriptions

1. Stude t’s Na e: E ad Alhothly.
Tea her’s Na e: I rahi Aladi i.
LOOPS

2. What is the loops?
A loop statement allows us to execute a statement or group of
statements multiple times and following is the general from of a
:loop statement in most of the programming languages

3. C++ programming language provides
the following types of loop to handle
looping requirements..
1- While Loop.
2- For Loop.
3- Do…While Loop.
4- Mested loops.

4. While Loop:
Repeats a statement or group of statements while a given
condition is true. It tests the.condition before executing the
.loop body.
Example:#
#include <iostream>
using namespace std;
int main ()
{
// Local variable declaration:
int a = 10;
// while loop execution
while( a < 20 )
{
cout << "value of a: " << a << endl;
a++;
}
return 0;
}

5. For Loop:
Execute a sequence of statements multiple times and
abbreviates the code that manages the loop variable.
Example:#
#include <iostream>
using namespace std;
int main ()
// for loop execution
for( int a = 10; a < 20; a = a + 1 )
{
cout << "value of a: " << a << endl;
}
return 0;
}

6. Do…While Loop:
Like a while statement, except that it tests the condition at
the end of the loop body.
Example:#
#include <iostream>
using namespace std;
int main ()
// Local variable declaration:
int a = 10;
// do loop execution
do { cout << "value of a: " << a << endl;
a = a + 1;
}
While ( a < 20 );
return 0;
}

7. Mested loops:
You can use one or more loop inside any another
while, for or do..while loop.
Example:#
#include <iostream>
using namespace std;
int main ()
{
int i, j;
for(i = 2; i<100; i++) {
for(j = 2; j <= (i/j); j++) if(!(i%j))
break; //
if factor found, not prime
if(j > (i/j)) cout << i << " is
primen";
}
return 0; }

8. Loop Control Statements:
Loop control statements change execution from its normal sequence.
When execution leaves a scope, all automatic objects that were created
in that scope are destroyed.
C++ supports the following control statements:
1- Break statement.
2- Continue statement.
3- Goto statement.

9. Break statement:
Terminates the loop or switch statement and transfers
execution to the statement immediately following the loop or
switch.
Example:
#include <iostream>
using namespace std;
int main ()
{ // Local variable declaration:
int a = 10;
// do loop execution do
{
cout << "value of a: " << a << endl;
a = a + 1;
if( a > 15) {
// terminate the loop break; }
}
while( a < 20 );
return 0; }

10. Continue statement:
Causes the loop to skip the remainder of its body and
.immediately retest its condition prior to reiterating
Example:
#include <iostream>
using namespace std;
int main ()
// Local variable declaration:
int a = 10;
// do loop execution do {
if( a == 15) {
// skip the iteration.
a = a + 1; continue; }
cout << "value of a: " << a <<
endl;
a = a + 1; }
while( a < 20 );
return 0; }

11. Goto statement:
Transfers control to the labeled statement. Though it is not
advised to use goto statement in your program.
Example:
#include <iostream>
using namespace std;
int main ()
// Local variable declaration:
int a = 10;
// do loop execution LOOP:
do { if( a == 15) {
// skip the iteration.
a = a + 1;
goto LOOP;
}
cout << "value of a: " << a << endl;
a = a + 1;
}while( a < 20 );
return 0;
}

12. :The Infinite Loop
A loop becomes infinite loop if a condition never becomes
false. The for loop is traditionally used for this purpose.
Since none of the three expressions that form the for loop
are required, you can make an endless loop by leaving the
conditional expression empty.

13. References:
www.google.com
d.com/learn/tutorials/t3https://unity
opics/scripting/loops
https://www.tutorialspoint.com/cplu
splus/cpp_loop_ty
pes.htm
https://www.youtube.com/watch?v=
eYJEYYAsk-b

14. THANK YOU FOR WATCHING