The do-while loop is a post-tested loop. Using the do-while loop, we can repeat the execution of several parts of the statements. The do-while loop is mainly used in the case where we need to execute the loop at least once. The do-while loop is mostly used in menu-driven programs where the termination condition depends upon the end-user.

The syntax of the C language do-while loop is given below:

The below example here is to print natural numbers within 10 from 1 number with the do while loop.

int i=1; //assisning number 1 to i variable to start the natural numbers

printf("Hi This is pavan.. WELCOME. Here I m Printing Natural Numbers:\n");

printf("%d",i);//printing i variable's value

i=i+1; // assigning incrementation to the i variable

printf("\n"); //For printing the line break

Switch case listed do while program to print some specific text based on the options list which are embedded/showing in the program in the terminal/compiler when executing it.

printf("\n1. Print Hello Pavan\n2. Print C Language\n3. Exit\n");

printf("Atleast Now enter a valid choice/option");

printf("If you want to enter again/more?");

This is the C Program to print the table of the number which gave as input to the terminal/compiler by the user of the System. Here you can print any kind of table with up to the 10 multiples of the user input number. kindly give it a try and know how the table’s program is working using do while. even though if the condition in the do while is incorrect/false the program inside the loop will be executed just once without any error/any other.

printf("Enter number to print its table : ");

Below C Program is to print the sum of natural numbers using do while loop in my way. Check it you will get a small idea to build many big projects of programming in the future.

printf("Enter number to print sum of the natural numbers in my way : ");

Our focus in this blog post will be on the do while loop in C, including its diagram as well as examples.

Do while loop in C :how to use it,its diagram with example

A nested loop is a loop within a loop, an inner loop within the body of an outer one. How this works is that the first pass of the outer loop triggers the inner loop, which executes to completion. Then the second pass of the outer loop triggers the inner loop again. This repeats until the outer loop finishes. Of course, a break within either the inner or outer loop would interrupt this process.

Quite a few loops can be characterized inside another loop, i.e., there is no limitation for characterizing quite a few loops. The nesting level can be characterized at n times. You can characterize any kind of loop inside another loop; for instance, you can characterize 'while' loop inside a 'for' loop.

The above syntax is a single loop condition inside a loop condition. In this way, there can be many conditions too.

In the above stream graph, we can see that two circumstances are given. The inward loop condition gets executed just when the external loop condition gives the Boolean result is True. Else the stream control straightforwardly leaves both the loops. Presently coming into the internal loop execution, If the loop condition gives a genuine outcome, then, at that point, the square of articulations under that loop and the gradual condition gets executed. Also thusly, if the condition gives a Boolean condition as False, the inward loop gives its control back to the external loop, and again same circumstances/loops get executed/rehashed.

Nested loop in ‘for’ condition. This we can generally use for creating or printing a multi-dimensional array.

printf("Enter value for x(rows)- max of 10: ");

printf("Enter value for y(columns) - max of 10: ");

Let us see how the above example code works:

Firstly, we declare the integer values for defining the number of rows and columns.

We then have to take the inputs from the user as per the values specified for the number of rows and columns.

The user input is taken with the help of ‘two for loops’ as we are creating a 2-D array.

The first ‘for-loop’ is for the number of rows and the second loop is for the columns.

In taking a user input for an array, we are considering it as a row by row concept.

So, when all the columns in the first row are filled, the compiler point would then increment come to the next row by which all the columns are filled, and the process continues.

The same process flow continues for the loops for printing the respective output in an array format.

In this manner, the nested loops are implemented. Now, let us have another example for nested loops.

We will learn how to implement the nested loop in C, its diagram, and an example in this blog post.

Best use of Nested loop and how to implement it

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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loops in c

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Do while loop in C :how to use it,its diagram with example

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