C – Introduction to Loops

Loop: A Block of instructions execute repeatedly as long the condition is valid.

Note: Block executes only once whereas Loop executes until condition become False

Java Supports 3 types of Loops:

1. For Loop
2. While Loop
3. Do-While Loop

For Loop: We use for loop only when we know the number of repetitions. For example,

• Print 1 to 10 numbers
• Print Array elements
• Print Multiplication table
• Print String character by character in reverse order

While loop: We use while loop when we don’t know the number of repetitions.

• Display contents of File
• Display records of Database table

Do while Loop: Execute a block at least once and repeat based on the condition. ATM transaction: When we swipe the ATM card, it starts the first transaction. Once the first transaction has been completed, it asks the customer to continue with another transaction and quit.