C Programming for Loop. Loops are used in programming to repeat a specific block until some end condition is met. There are three loops in C programming: for loopwhile loopdo.. The syntax of a for loop is. Statement; test. Expression; update. Syntax of do while loop is do .Statement). . If the test expression is false (0), for loop is terminated. But if the test expression is true (nonzero), codes inside the body of for loop is executed and the update expression is updated. This process repeats until the test expression is false. The for loop is commonly used when the number of iterations is known. To learn more on test expression (when test expression is evaluated to nonzero (true) and 0 (false)), check out relational and logical operators. Flowchart. Example: for loop// Program to calculate the sum of first n natural numbers. Positive integers 1,2,3.. Suppose, the user entered 1. The count is initialized to 1 and the test expression is evaluated. Since, the test expression count < = num (1 less than or equal to 1. Then, the update statement ++count is executed and count will equal to 2. Again, the test expression is evaluated. Since, 2 is also less than 1. Now, the sum will equal 3. This process goes on and the sum is calculated until the count reaches 1. When the count is 1. Therefore, the loop terminates and next, the total sum is printed. 2 Goals of this Lecture! These codes illustrate how to create various patterns using c programming. Most of these c programs involve usage of nested loops and space. C Loops Explained with Examples (For Loop, Do While and While) by Himanshu Arora. There are three types of loops in C. For loop; Do while loop. C programming while and do.while Loop. After reading this tutorial, you will learn how to create a while and do.while loop in C programming.
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