Syntax :-
do{
// do Statement(s);
}while(condition);
Q :- Write a JavaScript program to print natural numbers using do while loop.
Source Code :
<!DOCTYPE html>
<html>
<head>
<title>Natural Numbers</title>
</head>
<body>
<script type="text/javascript">
var c=0, n=0;
n=window.prompt("Enter a Value",5);
n=parseInt(n);
document.write("N : "+n+"<br>");
do{
c=c+1;
document.write(c+" ");
}while(c<n);
</script>
</body>
</html>
Output :-
N : 5 1 2 3 4 5
Q :- Write a javascript program to print even number with the help of do while loop.
Source Code :
<!DOCTYPE html>
<html>
<head>
<title>Even Numbers</title>
</head>
<body>
<script type="text/javascript">
var c=0, n=0 , e=0;
n=window.prompt("Enter a Value",5);
n=parseInt(n);
document.write("N : "+n+"<br>");
do{
c=c+1;
e=2*c;
document.write(e+" ");
}while(c<n);
</script>
</body>
</html>
Output :-
N : 5 2 4 6 8 10
Q :- Write a javascript program to print odd number with the help of do while loop.
Source Code :
<!DOCTYPE html>
<html>
<head>
<title>Odd Numbers</title>
</head>
<body>
<script type="text/javascript">
var c=0, n=0 , o=0;
n=window.prompt("Enter a Value",5);
n=parseInt(n);
document.write("N : "+n+"<br>");
do{
c=c+1;
o=(2*c)-1;
document.write(o+" ");
}while(c<n);
</script>
</body>
</html>
Output :-
N : 5 1 3 5 7 9
Q :- Write a JavaScript program to print the natural numbers in reverse order using do while loop.
Source Code :
<!DOCTYPE html>
<html>
<head>
<title>Natural Numbers in reverse order</title>
</head>
<body>
<script type="text/javascript">
var n=0;
n=window.prompt("Enter a Value",5);
n=parseInt(n);
document.write("N : "+n+"<br>");
do{
document.write(n+" ");
n=n-1;
}while(n>0);
</script>
</body>
</html>
Output :-
N : 5 5 4 3 2 1
Q : Write a JavaScript program to print the even numbers in reverse order using do while loop.
Source Code :
<!DOCTYPE html>
<html>
<head>
<title>even numbers in reverse order</title>
</head>
<body>
<script type="text/javascript">
var n=0,e=0;
n=window.prompt("Enter a Value",5);
n=parseInt(n);
document.write("N : "+n+"<br>");
do{
e=2*n;
document.write(e+" ");
n=n-1;
}while(n>0);
</script>
</body>
</html>
Output :-
N : 5 10 8 6 4 2
Q : Write a JavaScript program to print the odd numbers in reverse order using do while loop.
Source Code :
<!DOCTYPE html>
<html>
<head>
<title>odd numbers in reverse order</title>
</head>
<body>
<script type="text/javascript">
var n=0,o=0;
n=window.prompt("Enter a Value",5);
n=parseInt(n);
document.write("N : "+n+"<br>");
do{
o=(2*n)-1;
document.write(o+" ");
n=n-1;
}while(n>0);
</script>
</body>
</html>
Output :-
N : 5 9 7 5 3 1
Q :- Write a JavaScript program to print and sum a square series of natural numbers using while loop.
Source Code :
<!DOCTYPE html>
<html>
<head>
<title>square series of natural numbers</title>
</head>
<body>
<script type="text/javascript">
var c=0, n=0, p=0, s=0;
n=window.prompt("Enter a Value",5);
n=parseInt(n);
document.write("N : "+n+"<br>");
do{
c=c+1;
p=c*c;
s=s+p;
document.write(p+" ");
}while(c<n);
document.write("<br>"+"Sum = "+s);
</script>
</body>
</html>
Output :-
N : 5 1 4 9 16 25 Sum = 55
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