Loop control statements:
- Loop control statements execute a block of instructions repeatedly as long as the condition is valid.
- Loops classified into
- For loop – we use for loop when we know the number of iterations
- Print 1 – 10 numbers
- Print all elements of Array
- For loop – we use for loop when we know the number of iterations
- While Loop – we use when we don’t know the number of iterations
- Print file text – we don’t know how many lines are present
- Print Database table details – we don’t know how many records are present
- Do-While Loop – When we want to execute loop at least once. Execute the Block and the check the condition from the next iteration.
Program to print numbers from 1 to 10 and 10 to 1:
| <html> <head> <script> function print1to10(){ for(var i=1 ; i<=10 ; i++){ document.write(“i val : ” + i + “<br/>”); } } function print10to1(){ for(var i=10 ; i>=1 ; i–){ document.write(“i val : ” + i + “<br/>”); } } </script> </head> <body> <button onclick=”print1to10()”> Print 1 to 10 </button> <button onclick=”print10to1()”> Print 10 to 1 </button> </body> </html> |