What would you like to do?" ) # Set an initial value for choice other than the value for 'quit'. print ( " \n Welcome to the nature center. Here we discuss the overview of while loop in python and how while loop works in python along with its example.# Give the user some context. Immediately the control goes out of the loop. In that case, the while expression fails and returns false. This will be continued until the value of I becomes 11. The value of the counter will again be incremented by one.
Suppose a condition will be true in the second case, the statement under if a condition will be executed. After that, the value of the counter will be incremented by one.
During the first case, the value of i is one, so the modulus will not be zero hence if a condition will fail and the else condition statement will get executed. In the first case, the expression will return true, and hence the control will flow inside the body of the loop where it contains conditional statements if-else. So, as you can see in the above code, we have the expression to check whether the number is less than 10 or not. The counter will have an initial value as one since we will start at 1 and then keep on incrementing the counter by one. This means the lower limit is 1 and the upper limit is 10. Let us print the even and odd numbers present between 1 and 10. The below screenshot shows an infinite loop. Let us now look into a different example in which we will also use conditional statements like if-else along with while loop. This leads us to the scenario of an infinite loop as it never terminates. This flow repeats itself again and again as the starting expression is always true, and the value of n keeps incrementing by 1 each time. Upon execution, it again goes to the top of the loop and checks the expression, which is again true as the value of n is now 2. The control then enters the loop and increases n by 1, and then it executes the two print statements. If we take a close look at the above example, we will see that the conditional expression n>0 is the true first time as an initial value of n is 1. This means we will add numbers starting from 1 and end at 10 since we will use a while loop, so we will provide a condition and also have to keep a variable as a counter as we have to increase the counter by one after each addition. Here the problem statement is to add the first 10 natural numbers. Since we have discussed how the control flows inside the while loop, let’s see some examples. The while loop is also called the entry controlled loop, as the entry of the control inside the loop firmly depends on whether the expression returns true or false. Once the instructions in the body of the loop are executed for the first time, the control again goes to the top of the loop where the entry expression or condition is present if the expression returns true, the control executes the same instructions present in the body of the loop again, and if the expression returns false the control comes out of the loop. If and only the expression returns true, the control can enter inside the loop and execute the instructions present inside the loop. Before we enter the while loop, there is a condition check basically, it is an expression that returns the Boolean result, which means the output of the expression will either be true or false. This flow chart gives us information about how the instructions are executed in a while loop.Īfter going through the syntax and flow, we will now understand how the flow actually works.
The flow of execution for the while loop is shown below. Web development, programming languages, Software testing & others while expression: Start Your Free Software Development Course
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