Loop statements in c++ execute a certain block of the code or assertion a couple of times, specifically used to lessen the period of the code using executing the equal function a couple of times, lowering the redundancy of the code. C++ helps various sorts of loops like for loop, whilst loop, do-whilst loop, everyone has its syntax, benefits, and usage. In the programming global, the loop is a control shape this is used when we need to execute a block of code, a couple of times. It normally maintains to run till and unless some give up situation is fulfilled.

If we did not have loops, we would have to use the iterative method to print a repetitive block of statements, which would look something like this:

Now that we have seen how a Loop works, let us make it clearer by going through the types of Loops out there. In C++ programming, we have three types of Loops in C++ :

Loop is an entry-controlled loop, meaning that the condition specified by us is verified before entering the loop block. It is a repetition control structure. The loop written by us is run a specified number of times.

To control the loop, we use a loop variable in For loop. This variable is first initialized to some value, then we perform the check on this variable comparing it to the counter variable, and finally, we update the loop variable.

for(initialization expression; test expression; update expression)

// statements to execute in the loop body

Here we initialize the loop variable to a particular value. For example, int i=1;

Here, we write the test condition. If the condition is met and returns true, we execute the body of the loop and update the loop variable. Otherwise, we exit the For loop. An example for test expression is i <= 5;

Once the body of the loop has been executed, we increment or decrement the value of the loop variable in the update expression. For example, i++;

While loop is also an entry controlled loop, where we verify the condition specified by us, before running the loop. The difference is being that we use For loops when we know the number of times the body of the loop needs to run, whereas we use while loops in circumstances when beforehand we do not know the precise number of times the body of the loop needs to run. The execution of the loop is terminated based on the test condition.

The syntax of the loops differs only in the placement of the three expression statements.

Let us look at an example of a while loop:

int i = 0;    // initialization expression

Do while loop is an exit controlled loop, meaning the test condition is verified after the execution of the loop, at the end of the body of the loop. Hence, the body executes at least once, regardless of the result of the test condition, whether it is true or false. This happens to be the foremost difference between while loop and do while. In a while loop, the condition is tested beforehand, whereas in a do-while loop the condition is verified at the finish of the body of the loop.

In do while loop, we end the body of the loop with a semicolon, whereas the other two loops do not have any semicolon to end the body of their loops.

int i = 2;    // initialization expression

An infinite loop or an endless loop is a loop that does not have a proper exit condition for the loop, making it run infinitely. This happens when the test condition is not written properly and it permanently evaluates to true. This is usually an error in the program.

In this blog, we will discuss the Types and uses of Loops in C++

Types and uses of Loops in C++

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.

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