An infinite loop is a looping construct that does not terminate the loop and executes the loop forever. It is also called an indefinite loop or an endless loop. It either produces a continuous output or no output.

An infinite loop is useful for those applications that accept the user input and generate the output continuously until the user exits from the application manually. In the following situations, this type of loop can be used:

All the operating systems run in an infinite loop as it does not exist after performing some task. It comes out of an infinite loop only when the user manually shuts down the system.

All the servers run in an infinite loop as the server responds to all the client requests. It comes out of an indefinite loop only when the administrator shuts down the server manually.

All the games also run in an infinite loop. The game will accept the user requests until the user exits from the game.

An unintentionally infinite loop gets created by a bug in the code, by mistake, or by specifying the condition which never becomes false. An intentionally infinite loop is explicitly created to achieve some requirement in an application. The loop structures we can use to create intentionally or explicitly infinite loops and run the code specified in a loop repeatedly or infinite times. So we can use the following loops to create an infinite loop –

In the above syntax, three parts of the for loop that are initialized, condition, and increment/ decrement are not provided, which means no start value no end condition. So the loop runs for infinite times.

Next, we write the c code to understand the infinite for loop working more clearly with the following example.

As in the above code, the for loop is running for infinite times and printing the I value that is 10 infinitely.

Next, we write the c code to show the kind of mistakes that can lead to an infinite loop in for loop –

As above the loop is running infinite times because short int ranges are -32768 to 32767, so when i is the increment above to 32767 it becomes negative and hence the condition becomes always true.

In the above syntax, the condition pass is 1 (non zero integers specify true condition), which means the condition is always true and runs for infinite times.

Next, we write the c code to create the infinite loop by using the while loop with the following example.

As in the above code while loop runs infinite times because the condition always becomes true and the I value is updated infinite times.

A description of Infinite loops is provided in this blog post, along with examples of various types of infinite loops.

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