04- loops in c++

in programming languages, loops are used to execute a set of statements repeatedly, until a particular condition is satisfied.

There are 3 kind of loops in c++
1. While loop
2.For loop
3.Do-While loop



1.While loop

Example:-counting from 0 to 9 (using while loop)




#include<iostream>
using namespace std;

int main()
{
    int x=0;

while (x<=9) 

    {
       cout<<x<<endl;
       x=x+1;
    }

    return 0;
}

The same code can be executed by for loop as well


2.For LOOP

syntax :-

   for ( intitiation point ; termination point ;  increment or decrement)

    {condition;
}


Example :-counting from 0 to 9 (using for loop)

#include<iostream>
using namespace std;
int main ()

{
    int x=0;

    for ( x=0; x<=9; x=x+1)

    {cout<<x<<endl;
}


    return 0;

}

Example :-Multiplication table using for loop

#include<iostream>

using namespace std;
int main()

{

    int a;
    cout<<"Enter a positive integer";
    cin>> a;

    for (int b=1; b<= 10; b=b+1)

    {
        cout <<a<<"x"<<b<<"="<<a*b<<endl;

    }

    return 0;

}

3.Do while loop


The same program that counted 0-9,,,, can also be made using this loop..

The especiality of do while loop is that it tests the condition at last,, whether its true or not..


syntax :-

do{statements;

}
while ( conditions) ;

dont forget the semicolon after while statement




Example :-counting from 0 to 9 (using do-while loop)
    

#include<iostream>
using namespace std;
int main()

{

int x=0;

do {cout<<x<<endl;

x=x+1;}

while (x<=9) ;

    return 0;

}