/** * C program to print natural numbers using while loop */ #include int main() { /* Loop counter variable declaration and initialization*/ int n = 1; /* Loop condition */ while(n <= 10) { /* Body of loop */ printf("%d ", n); /* Update loop counter variable */ n++; } return 0; } The syntax of a while loop in C programming language is − while(condition) { statement(s); } Here, statement(s) may be a single statement or a block of statements. The condition may be any expression, and true is any nonzero value. In some situations it is necessary to execute body of the loop before testing the condition. • The loop statements while, do-while, and for allow us execute a statement(s) over and over. As in the while loop, if the controlling condition becomes false in the first iteration only, then the body of the while loop is not executed at all. Its output should look something like this-. Following program illustrates while loop in C programming example: #include #include int main () { int num=1; //initializing the variable while (num<=10) //while loop with condition { printf ("%d\n",num); num++; //incrementing operation } return 0; } Output: 1 2 3 4 5 6 7 8 9 10. To perform a particular task or to run a specific block of code several times, the concept of LOOP comes in picture. For. The do while loop differs significantly from the while loop because in do while loop statements in the body are executed at least once even if the condition is false. A for loop will run statements a set number of times. If the underlying condition is true, then the control returns to the loop otherwise exit it. A while loop has its test condition at the beginning of the loop. Keep in mind that in a do-while loop, the semicolon always comes after while statement but not in while loop. while loop is a most basic loop in C programming. • Like a conditional, a loop is controlled by a boolean expression that determines how many times the statement is executed. With “continue;” it is possible to skip the rest of the commands in the current loop and start from the top again. Simplicity of while loop exists in its working mechanism. There are mainly three types of loops in C. In this tutorial, we will see the first two loops in detail. If the condition is true, the flow of control jumps back up to do, and the statement(s) in the loop executes again. If the condition returns boolean true the loop block is executed, otherwise not. for loop is easy to implement if you specifically know start and end position of the loop counter. Syntax do { //statement block } While(condition); 3.3. C program to read an integer and print its multiplication table. For example, the following code will execute exactly ten times: int n = 0; while (n < 10) { n++; } While loops can also execute infinitely if a condition is given which always evaluates as true (non-zero): while (1) { /* do something */ } However, best practice is to initialize all important loop variable just before the loop. While Loop. Where to put these? Here is a simple example to find the sum of 1 to 10 using the do-while loop, Its output should be something like this-. Code: #include void main() { int i = 10; do Body of loop contain single or set of statements to repeat. It define statements to repeat. Example: for(int i=0;i>=0;i++) {//code} 3. Above was the explanation of the while and do-while loops. Control is transferred inside the body of the while loop. Likewise, you can keep your loop update part just before the end of loop. Let us write a C program to print natural numbers from 1 to 10 using while loop. - using while loop; Write a C program to print all alphabets from a to z. Here, we have initialized i to 1. The output for both the following programs is same, check from below screenshot. While and do while loop in c programming Sometimes while writing programs we might need to repeat same code or task again and again. Follow on: Facebook | Twitter | Google | Website or View all posts by Pankaj. Let's take a look at each. Write a C program to print all natural numbers from 1 to n. - using while loop; Write a C program to print all natural numbers in reverse (from n to 1). Loops in C/C++ come into use when we need to repeatedly execute a block of statements.. During the study of ‘for’ loop in C or C++, we have seen that the number of iterations is known beforehand, i.e. It risks the security which is like allowing an unauthorized person into a facility and then asking for his ID. Step 1 and 2 are repeated until the loop condition is met. A while loop is very similar to a repeating if statement. The following example starts at … He works at Vasudhaika Software Sols. Generally, the do-while loop is not preferred in applications as it first executes the block of statements and then checks the condition. Example 1: for loop // Print numbers from 1 to 10 #include int main() { int i; for (i = 1; i < 11; ++i) { printf("%d ", i); } return 0; } Output The while and for loops test the termination condition at the top. When i is 1, the test expression i <= 5 is true. var prevPostLink = "/2017/08/for-loop-in-c-programming.html"; Example of while loop in C language, Program to print table for the given number using while loop in C, covering concepts, control statements, c array, c pointers, c structures, c union, c strings and more. However, things in the real life are not so simple. We can loop different kinds of … In this post we will continue our discussion on while loop. This is an example of while loop in C programming language - In this C program, we are going to print numbers from 1 to 10 using while loop. The loop iterates while the condition is true. Notice that unlike the while loop, in do while a semicolon(;) is placed after the condition. List of loop programming exercises. Iteration is the process where a set of instructions or statements is executed repeatedly for a specified number of time or until a condition is met. The above two steps are repeated, until loop condition is true. Here is a simple example to find the sum of 1 to 10 using the do-while loop Write a program in C to multiply two numbers without actually using the * operator but have to use both the while and do-while loops. We will see the for loop in detail in the next chapter. while loop is an entry controlled looping construct. By contrast, the third loop in C, the do while loop, tests at the bottom after making each pass through the loop body; the body is always executed at least once.. The main use of the do-while loop is there is a need to execute the loop at least once. The syntax of the do is below, do statement while (expression); once the statement is executed, then expression is evaluated. A while loop continues executing the while block as long as the condition in the while remains true. The below flowchart will help you understand the functioning of the do-while loop. By Chaitanya Singh | Filed Under: c-programming. In the previous tutorial we learned while loop in C. 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. Example 1: while loop // Print numbers from 1 to 5 #include int main() { int i = 1; while (i <= 5) { printf("%d\n", i); ++i; } return 0; } Output. C Program to print tables from numbers 1 to 20. If the underlying condition is true, then it goes ahead and executes the block of code in the loop. In previous post, we began our discussion on looping statements and learned for loop. The simplest of three loops in C Language is the C while loop.In common language while has fairly obvious meaning: the while-loop has a condition:. 3.2. The general form of for statement is as under: 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. Syntax. Server Side ... C# While Loop. The loops are the main constructs to implement iterative programming in C. Now that you have started this journey of learning C programming, there will be instances where you may need to run a particular statement block more than once. Initially, The initialization statements execute only once. While loop in C with programming examples for beginners and professionals. The while loop begins by first checking the terminal condition and then decides whether to enter the loop or not. var nextPostLink = "/2017/09/do-while-loop-c-programming.html"; Pankaj Prakash is the founder, editor and blogger at Codeforwin. It contains only two parts - condition and body of loop. It provides flexibility to define loop without initialization and update parts (present in for loop). It executes a certain block of statements based on a certain condition present at the beginning of the loop. Basic and conditional preprocessor directives. They are: Using a for Loop; Using a while Loop; Using a do-while Loop; C for Loop. #include int main() { int count=1; while (count <= 4) { printf("%d ", count); count++; } return 0; } Output: 1 2 3 4. step1: The variable count is initialized with value 1 and then it has been tested for the condition. 1 2 3 4 5. do while loop. Wile loop in C How while loop works in C language: While loop in C programming language is used to execute a block of statements repeatedly until a given condition returns false.It is similar to for loop in C.. Syntax: do {// some code which run infinite times} while(1); Next we write the c code to create the infinite loop by using do-while loop with the following example. The example below uses a do/while loop. At this point, you might be thinking about loop counter variable-initialization and variable-update part. do-while loop: do while loop is similar to while loop with the only difference that it checks for the condition after executing the statements, and therefore is an example of Exit Control Loop. A while loop in C programming repeatedly executes a target statement as long as a given condition is true. This process repeats until the given condition … Hence, the body of the while loop is executed. We use while loop to repeat set of statements when number of iterations are not known prior to its execution. But you can also decrement in a while loop. The condition of the loop is tested before the body of the loop is executed, hence it is called an entry-controlled loop.. E.g., You may want to calculate the interest paid … In the while loop there is an if statement that states that if i equals ten the while loop must stop (break). while (condition) { statements; } If the statements are executed while the condition has the value “true” (1).The first important thing about this while loop is that has a conditional expression (something like (a > b) etc… In this C programming class, we’ll cover the C while and do-while loop statements. For example – reading instructions from user until terminated manually, waiting for client connection until connected or cancelled, reconnecting to the server until connected. For this C provides feature of looping which allows the certain block of code to be executed repeatedly unless or until some sort of condition is satisfied even though the code appears once in the program. The below flowchart will help you understand the functioning of the while loop. 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. But the do-while loop is somewhat different from while loop. He loves to learn new techs and write programming articles especially for beginners. Let us write a C program to print natural numbers from 1 to 10 using while loop. while loop works in two steps. You may come across situation where you only know when to terminate the loop. Introduction to Nested Loop in C. As the name already suggests, a loop inside a loop is called Nested Loop. /* Do While Loop in C Programming example */ #include int main() { int number, total=0; printf("\n Please Enter any integer below 10 \n"); scanf("%d", &number); do { total = total + number; printf(" Number = %d\n", number); printf(" Total Value is: %d\n", total); number++; }while (number< 10); printf(" Total Value from outside the Loop is: %d \n", total); return 0; } The Loop Control Structure in C programming. In the example above, the while loop will run, as long i is smaller then twenty. C Decision Making: If, If-Else, Switch-Case, C For Loop Purpose, Flowchart, and Example. Body of loop contains single or set of statements. In this loop, the statement block gets executed first, and then the condition is checked. In short Pankaj is Web developer, Blogger, Learner, Tech and Music lover. The basic format of while loop statement is: Looping statements whose condition is checked prior to the execution of its body is called as Entry controlled loop.eval(ez_write_tag([[300,250],'codeforwin_org-medrectangle-4','ezslot_3',114,'0','0']));eval(ez_write_tag([[300,250],'codeforwin_org-medrectangle-4','ezslot_4',114,'0','1']));eval(ez_write_tag([[300,250],'codeforwin_org-medrectangle-4','ezslot_5',114,'0','2'])); Unlike for loop, while does not contain initialization and update part. How it works: In line 5, we have declared a variable i and initialized it to 1.First, the condition (i < 100) is checked, if it is true. It may be for input, processing or output. The syntax of a do...while loop in C programming language is − do { statement(s); } while( condition ); Notice that the conditional expression appears at the end of the loop, so the statement(s) in the loop executes once before the condition is tested. It execute all statements inside its body and transfer the program control to loop, Next loop condition receives program control and check condition. C Do-While Loop Example. The below flowchart will help you understand the functioning of the do-while loop. While loop in C starts with the condition, if the condition is True, then statements inside the while loop will be executed. Inside the body of the loop, if condition (i % 2 == 0) is checked, if it is true then the statement inside the if block is executed.Then the value of i is incremented using expression i++. For example, let's say you have 15 employees. 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. Do-While Loop. C – do while loop in C programming with example. while loop has one control condition, and executes as long the condition is true. We know there are generally many looping conditions like for, while, and do-while. as a Software Design Engineer and manages Codeforwin. You are free to initialize loop counter variables anywhere in the program before its use. These are three methods by way of which we can repeat a part of a program. Syntax: do { statements.. } while (condition); Flowchart: Example: Definition of do-while Loop. Like for loop, the while loop also first checks the condition and then execute the loop body. A loop is an instruction given to the computer that it has to run a specific part of the code for a given number of times. 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 … There can be any number of loops inside a loop. There is an exercise you can perform on the next page which will help you understand these two loops nicely. Example of while loop. Here, the “\n” in the printf call is used to move to the next line. In C there are three types of loops: for, while, and do...while. This program prints numbers from 1 to 10 without actually using the ten printf statements but a while loop. Example: while(inp='y') {//code} If loop condition mismatch may lead to an infinite loop. Here is a simple example of how a while loop works? Programming Python Reference Java Reference. The while loop in C Programming is to repeat a block of statements for a given number of times until the given condition is False. Again and again, while, and executes the block of statements based a. Next page which will help you understand the functioning of the loop will run statements a set of! €¦ while loop in C there are generally many looping conditions like for loop ) thisâ prints. Then the control returns to the loop before testing the condition is true, it! 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