After that, on asking the value of choice, the user entered 1, making choice equal to 1. The user first entered 4, which is even and so the message “Your number is even” gets printed. In the first iteration, the condition of the loop is true because the value of choice is 1, and hence the statements in the body of the loop get executed. After this, the user is again asked to enter a number - 1 if he wants to check more and 0 otherwise, and this entered number is assigned to the variable choice. In the body of the loop, it is checked if the number entered by the user is even or odd and the corresponding message is printed. In each iteration, if the condition of the loop is true, the statements in the body of the loop are executed. Since the condition of the loop is choice = 1, the loop will run until the value of choice becomes something other than 1. The next program prints the multiplication table of 12 using a while loop.Įnter a number to check odd or even 4 Your number is even Want to check more 1 for yes 0 for no 1 Enter a number to check odd or even 3 Your number is odd Want to check more 1 for yes 0 for no 0 I hope you checked all your numbers. The following animation will also help you to understand the working of the while loop. In the above example, there were ten iterations. Cool, right?Ĭhecking of the condition and executing the body of the loop makes one iteration. Similarly, you can also print the first 1000 natural numbers using the same number of lines of code. In this way, we printed the first 10 natural numbers without printing them separately one by one. Now, this time the condition n <= 10 becomes false and the loop gets terminated. 10 is printed and the value of n is increased to 11. Going on, when the value of n becomes 10, again the condition n <= 10 is true. 2 is printed and the value of n is increased to 3. This time also the condition n <= 10 is true because the value of n is 2. The second statement n++ increases the value of n by 1, making n equal to 2. The first statement (n) prints the value of n i.e. If the condition is true, then the statements of the loop are executed. While(n <= 10) → The condition n <= 10 of the loop is checked. The body of the loop consists of the statements (n) and n++. We are using decrement operator in the loop so the value of i decreases by one after each iteration of the loop and at some point the condition i>1 returns false, this is when the loop stops.In this example, the condition of the while loop is n <= 10. Here we are displaying the value of variable i inside the loop body. Third step: After every execution of for loop’s body, the increment/decrement part of for loop executes that updates the loop counter.įourth step: After third step, the control jumps to second step and condition is re-evaluated. Once the condition returns false, the statements in for loop does not execute and the control gets transferred to the next statement in the program after for loop. Second step: Condition in for loop is evaluated on each iteration, if the condition is true then the statements inside for loop body gets executed. We call this the control flow, or the flow of execution of the program.įirst step: In for loop, initialization happens first and only one time, which means that the initialization part of for loop only executes once. Flow of Execution of the for LoopĪs a program executes, the interpreter always keeps track of which statement is about to be executed. Statement: The statements inside the loop body keeps executing for each iteration of the loop until the loop stops. This is to modify the loop counter value so that at one point condition becomes false and the loop ends. Increment/Decrement: In this part of the loop declaration, you can specify the increment or decrement of loop counter. The loop keeps repeating until the condition becomes false. This condition determines till when the loop should keep repeating. This executes only once when the loop starts.Ĭondition: This is one of the important part of the loop. This is an optional part of the loop as the variables can be initialized before the loop. Initialization: In the initialization part, variables like loop counter (you will generally see i and j in loops, these are the loop counters) are initialized. Syntax of for loop: for(initialization condition increment/decrement) You will also learn nested for loop, enhanced for loop and infinite for loop with examples. In this tutorial you will learn about for loop in Java. In Java we have three types of basic loops: for, while and do-while. For loop is used to execute a set of statements repeatedly until a particular condition returns false.

For loop java