The difference between recursion and iteration is that recursion is a mechanism to call a function within the same function and iteration it to execute a set of instructions repeatedly until the given condition is true. In the case of descending a recursive structure such as a tree, memory requirement is of the same order using either recursion or iteration (proportional to depth). Solve a complicated task one piece at a time, and combine the results. Memory usage is less as it doesn’t use stack. For me, if using loops isn't more complicated and much more difficult than a recursion, I prefer to use loops. Emphasis of iteration:! Both can be used to solve programming problems. On the other hand in recursion, since it involves function call at each step, fresh memory is allocated for each recursive call. Recursion: In Recursion, Infinite recursive calls may occur due to some mistake in specifying the base condition, which on never becoming false, keeps calling the function, which may lead to system CPU crash. This is because there is usually more overhead associated with making recursive calls due to the fact that the call stack is so heavily used during recursion (for a refresher on this, read here: Recursion tutorial). both A & B are true. Infinite Repetition: Infinite Repetition in recursion can lead to CPU crash but in iteration, it will stop when memory is exhausted. Recursion uses more memory space than iteration because it uses stack instead of queue. Recursion is a self call, and uses more memory than iteration and fills in the system stack faster. recursion works in a stacked manner that’s why performance is slow. Summary – Recursion vs Iteration. (if memory can handle it, see interesting link here) For some cases, it's better to use recursion (like when dealing with trees.. traveling on a binary tree.. etc..). In a recursive function, each new iteration is run in a subscope of the last iteration (the variables for iteration i-1 are still alive during iteration 1, they just exist in a different scope). This article discussed the difference between recursion and iteration. Iteration reduces the processor’s operating time. Recursion vs. Iteration Roughly speaking, recursion and iteration perform the same kinds of tasks:! The fact is that recursion is rarely the most efficient approach to solving a problem, and iteration is almost always more efficient. Iteration makes the code size bigger. As per my (various) readings and experience, I have found the only one advantage of using recursion over iteration: Cleaner and simpler code which can easily be understood. An infinite loop occurs with iteration if the loop-condition test never becomes false. Then, should we use ‘recursion’ et al? That is, the memory space allocated once, is used for each pass of the loop. Code Size: Size of code is comparatively smaller in recursion. You can always make a recursive function an iterative one. In iteration, the code is executed repeatedly using the same memory space. None of the above are true.. Data Structures and Algorithms Objective type Questions and Answers. Memory: Memory usage is more as stack is used to store the current function state. Effect on Processor’s Operating Time: Recursion increases the processor’s operating time. every recursive call has to be stored. Iteration use little memory: Code Size: The code size is comparatively smaller. Since, Iteration does not need initializing variable again and again, It’s performance is fast: Memory Space: Recursion consumes more memory because it uses the stack. 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