In some situations it is necessary to execute body of the loop before testing the condition. In contrast, if the condition in ‘do-while’ loop is false, then also the body of the loop is executed at least once then the condition is tested. Learn C Loops: While and Do-While. endstream endobj 124 0 obj <>stream Your email address will not be published. The below flowchart will help you understand the functioning of the while loop. The do-while loop . In some situations it is necessary to execute body of the loop before testing the condition. Looping statements whose condition is checked after execution of its loop body is called as Exit controlled loop. Here is a simple example of how a while loop works? Compiler: VC++ Express Edition 2005 2. On the other hand, the do-while loop verifies the condition after the execution of the statements inside the loop. 1 0 obj <> endobj 13 0 obj <> endobj 5 0 obj <> endobj 4 0 obj <>stream 3.2. Unlike other two loops do...while contain semicolon at the end. The output for both the following programs is same, check from below screenshot. The above 2-4 steps are repeated till condition is true. If the underlying condition is true, then the control returns to the loop otherwise exit it. If the condition results true, it repeats the process. After the first iteration, it again checks with the changed (increased/decreased) values of the variables (the condition operands) and decides the further course of execution. C programming supports three types of looping statements for loop, while loop and do...while loop. We can also have nested for loops, i.e one for loop inside another for loop. do { statement(s); } while( condition ); Loops are used when we want a particular piece of code to run multiple times. Next, it enters into the Do While loop. So Do While executes the statements in the code block at least once even the condition Fails. After every execution of the loop body, condition is verified, and if it is found to be true the loop body is executed again. In this case the input statement should run minimum once and should repeat in loop until user provides valid input.eval(ez_write_tag([[300,250],'codeforwin_org-medrectangle-4','ezslot_11',114,'0','0']));eval(ez_write_tag([[300,250],'codeforwin_org-medrectangle-4','ezslot_12',114,'0','1']));eval(ez_write_tag([[300,250],'codeforwin_org-medrectangle-4','ezslot_13',114,'0','2'])); Similar to while, do...while loop contains two parts - body of loop and loop condition. We use do...while loop if we need to execute loop body minimum once. He works at Vasudhaika Software Sols. var nextPostLink = "/2017/09/nested-loops-in-c-programming.html"; Pankaj Prakash is the founder, editor and blogger at Codeforwin. Sometimes, while executing a loop, it becomes necessary to skip a part of the loop or to leave the loop as soon as certain condition becomes true. ��$�9��XG#NE� B�(���~]@���7���Q�樸���%����DCd�i�Eơr��3Hm�9%�B�}��e��n*�&��qn��ѹt k�w��o Чw�Ƞu:����Uϰ�n�+�f��Mu���z�'�^���Ы�v�BOq%B�� 2008-04-29T14:54:07+08:00 �[��2VzahfЮ�, C programming program examples on for, if, while, do-while and array questions and answer with flowcharts. The syntax of a do...while loop in C# is −. All rights reserved. C program to print sum of first 5 natural numbers using do..while loop Similar to while you can put loop counter variable-initialization statement before loop and variable-update before end of do...while loop. We use do...while loop when there is a need to check condition after execution of loop body. There are 3 types of Loop in C language, namely: while loop can be addressed as an entry control loop. It will execute the group of statements inside the C Programming loop. C programming supports three types of looping statements for loop, while loop and do...while loop. This program is a very simple example of a for loop. Setting: No Common Language Runtime support, Use Unicode Character Set and Compile as C Code (/TC) (others are default). A do while loop is similar to while loop with one exception that it executes the statements inside the body of do-while before checking the condition. Be careful while writing do...while loop. Basic and conditional preprocessor directives. Keep in mind also that the variable is incremented after the code in the loop is run for the first time. The iterations do not occur if, the condition at the first iteration, appears false. Conversely, the alternate name for the do-while loop is the exit-controlled and post-checking loop, the reason behind this is that the checking of the loop condition is followed by the execution of the body of the loop. After this line, the value in a Number variable tests against the while condition. The while loop checks the condition at the starting of the loop and if the condition is satisfied statement inside the loop, is executed. application/pdf 4. Body of loop contains single or set of statements to repeat. Examples of infinite while loop. Please refer. for loop is used to execute a set of statements repeatedly until a particular condition is satisfied. He loves to learn new techs and write programming articles especially for beginners. 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. 3. C programming program examples on for, if, while, do-while and array questions and answer with flowcharts In this way even if the condition is false the code inside the loop will be executed once which doesn’t happen in while. First, we initialize our variables. In the next line, we used one more printf statement to show that it is coming from outside the while loop. Here, the “\n” in the printf call is used to move to the next line.

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