Loops
While
Definition
While statement is known as loop or iterated structure because it keeps on executing a code written inside it till the condition given to it does not becomes true.
Syntax
while(condition){
//code to be iterated
}
Example
#include<iostream>
#include<conio.h>
void main(){
int a=0;
while(a<10)// condition is that while a<10 perform the below code, something must be done to //change the condition to false otherwise the loop will go on endlessly this is the reason why
//a is incremented inside the code
{
cout<<"Hello"<<endl;
a++;
}
getch();
}
Do-while loop
Definition
Do-while is also an iteration statement or loop but it performs the code first then checks the condition this can be sometimes an advantage or disadvantage.
Syntax
Example
Syntax
do{
//code to be iterated
}
while(condition);
Example
#include<iostream>
#include<conio.h>
void main(){
int a=0;
do{
cout<<"Hello"<<endl;
a++;
}
while(a<0); //same as while except code is performed first then condition is checked
//so that loop should
getch();
}
For loop
Definition
For loop keeps on iterating itself given an initial value, condition and increment value.
Syntax
Example
*iteration:-the repetition of a process
Definition
For loop keeps on iterating itself given an initial value, condition and increment value.
Syntax
for(initial value; condition; increment value)
{
//code to be iterated
}
Example
#include<iostream>//Declaring header files
#include<conio.h>
void main(){
int a[5]; //Declaring an array having 5 values
cout<<"Enter the values in the array:"<<endl; //Displaying a message
for(int i=0; i<5; i++)//for loop which starts with an initial value of 0,
//condition is i<5 and while condition is true increment 1 to i
{
cin>>a[i];
}
cout<<"Displaying the values stored in array in reversed order:"<<endl;
for(int i=4; i>=0; i--)//for loop which starts with an initial value of 4,
//condition is i>=5 and while condition is true decrement 1 to i
{
cout<<a[i]<<endl;
}
getch();
}
*iteration:-the repetition of a process
