Control Statements - While & Do while | OOP using JAVA | SNS Institutions

#snsinstitutions #snsdesignthinkers #designthinking The **while** and **do-while** loops are fundamental control statements in Java used for executing a block of code repeatedly based on a condition. In a **while loop**, the condition is evaluated **before** the execution of the loop’s body, making it an *entry-controlled loop*. If the condition is true, the statements inside the loop are executed, and after each iteration, the condition is checked again. This continues until the condition becomes false. Since the condition is checked first, it is possible that the loop body may not execute even once if the condition is initially false. On the other hand, the **do-while loop** is an *exit-controlled loop*. Here, the loop body executes **first**, and the condition is evaluated afterward. This ensures that the loop’s statements execute at least once, regardless of whether the condition is true or false initially. The syntax for `while` is: `while(condition) { // code }`, and for `do-while` is: `do { // code } while(condition);`. Both loops are useful in different scenarios: a `while` loop is ideal when the number of iterations is not known in advance and execution should only happen if the condition holds from the start, whereas a `do-while` loop is preferable when the code must run at least once before checking the condition. Proper use of these loops helps in controlling program flow efficiently, avoiding redundancy, and making the code cleaner and more logical. Care must be taken to update variables inside the loop to prevent infinite looping.