For example, if we want to ask a user for a number between 1 and 10, we don't know how many times the user may enter a larger number, so we keep asking "while the number is not between 1 and 10". Program Example Using a loop a program can execute code block for multiple times as required. The following is an algorithm for this program using a flow chart. The do while loop in the C language is basically a post tested loop and the execution of several parts of the statements can be repeated by the use of do-while loop. Every loop consists of three parts in sequence. Flow diagram – Nested do wile loop How to work Nested do while loop. C PROGRAMMING: THE IF, WHILE, DO-WHILE, FOR AND ARRAY WORKING PROGRAM EXAMPLES (with some flowcharts) 1. In this article, I am going to discuss the Do While loop in C Program with Examples.Please read our previous articles, where we discussed While loop in C with Examples. In some situations it is necessary to execute body of the loop before testing the condition. Following example illustrates the concept of do-while loop. Where while loop is one of them. I searched online and I found several examples even on different programming languages, for example, (PHP) Do-While Loop with Multiple Conditions, (Python) How to do while loops with multiple conditions, (C++) Using multiple conditions in a do…while loop, etc. to perform the desired action accordingly. It is another loop like ‘for’ loop in C. But do-while loop allows execution of statements inside block of loop for one time for sure even if condition in loop fails. Keep in mind also that the variable is incremented after the code in the loop is run for the first time. C For Loop for Beginners. Do-while loop is an exit controlled loop i.e. Loops are used when we want a particular piece of code to run multiple times. The loop iterates while the condition is true. It will execute the group of statements inside the C Programming loop. There are generally three types of loops in C programming Language: For loop, While loop and Do while loop. Note: For those who don’t know printf or need to know more about printf format specifiers, then first a look at our printf C language tutorial. Such situations can be handled with the help of do-while loop.do statement evaluates the body of the loop first and at the end, the condition is checked using while statement. C program to print all lowercase alphabets using while loop. It means the statements inside do-while loop are executed at least once even if the condition is false. We’ve taken up an entire chapter on the “for loop” because it is the most used iterative programming construct. Note: A single instruction can be placed behind the “for loop” without the curly brackets. do while loop. Example program to demonstrate while loop. Do While Loop Examples. Condition: It is checked after each iteration as an entry point to the loop. Next, it enters into the Do While loop. the number of times the loop body is needed to be executed is known to us.The while loop in C/C++ is used in situations where we do not know the exact number of iterations of loop beforehand. The do while loop works based on the condition in the while() parameter but at 1 st the program inside of the do while will be executed then the condition is checked. For understanding for loop, we must have prior knowledge of loops in C++. The do while construct consists of a process symbol and a condition. This is where we start to count. Let’s look at the “for loop” from the example: We first start by setting the variable i to 0. WHILE - WHILE loops … Mainly there are 3 types of loops available in C programming language. This is an example of while loop in C programming language - In this C program, we are going to print all uppercase alphabets from ‘A’ to ‘Z’ using while loop. 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