Ruby is an open-source object-oriented scripting language invented in the mid-90s by Yukihiro Matsumoto.

Unlike languages such as C and C++, a scripting language doesn’t talk directly to hardware. It’s written to a text file and then parsed by an interpreter and turned into code. These programs are generally procedural, meaning they are read from top to bottom.

Object-oriented languages, on the other hand, break out pieces of code into objects that can be created and used as needed. You can reuse these objects in other parts of the program or even other applications.

In ruby, retry assertion permit us to repeat the entire loop from the beginning, this new for programming hints, ordinarily, retry statement might be used in case if we're running on any transaction or another kind of looping wherein each generation of a loop has to achieve success or in some precise sequences, in case if we located any trouble with any generation of the going for walks loop we will use the retry announcement to begin the loop from the beginning, retry declaration is continually used within the loop this means that there need to be any generation for implementation of the retry announcement.

In the below we have written a simple syntax for the retry statement, we can explain the below syntax with the following steps.

We are running a beginning loop on the numeric value. Here numeric values can be anything, from 0 to any number.

Inside the beginning loop, we can perform some operations.

We have written a condition block that will check for any particular condition according to our requirements.

In case of the condition is true or success then the exception will be raised and the rescue block will play its job.

Inside the rescue block, we are checking for we have called the retry statement, which will start the loop from that point only.

We need to take care a lot while using retry as if it will not be used with proper logic and understanding the loop can go for infinite as it will keep calling retry.

Here retry should call with a proper limit, which means how many times it should do retry.

#Perform some operation the coming data on each iteration

raise conditional expression #If conditional expression successful simply it will fall into rescue block

# Here we will catch the exception raise inside begin block

Below is an example where we have taken any random number and run a loop on it to print the number, and if the number is greater than 7 raise an exception. The raised exception will be handled inside the rescue block. Inside the rescue block, we have commented on the retry statement, if we enable retry block then the loop will go for infinite time execution. As I have mentioned already we need to take care while using retry statements to avoid the infinite. Please follow the below example along with the screen of output.

puts "This the iteration number inside begin block #{number}"

# Here we are using the retry to call again

puts "Here retry statement will be called as it falls under rescue block #{number}"

As I have mentioned to you that we need to use retry very carefully to avoid an infinite loop. Below is an example where once retry will get call the loop will go for infinite and no further execution of the code happens. We need to always check our requirements before using retry. Please see the below example along with the screen of the output.

puts "Please try again to execute the code block ##{ tryAgain }"

raise "We are raising exception each time to check tryAgain count"

#Here retry statement will handle if try again value higher than 2 it will start to retry and nothing will print:

In this blog, we will discuss Ruby retry.

Ruby retry

Looping can be defined as repeating the same process multiple times until a specific condition is satisfied. There are three types of loops used in the C language. In this part of the tutorial, we are going to learn all the aspects of C loops.

The looping simplifies the complex problems into easy ones. It enables us to alter the flow of the program so that instead of writing the same code, again and again, we can repeat the same code a finite number of times. For example, if we need to print the first 10 natural numbers then, instead of using the print statement 10 times, we can print inside a loop that runs up to 10 iterations.

Using loops, we do not need to write the same code again and again.

Using loops, we can traverse over the elements of data structures (array or linked lists).

It executes the set of statements until the time a particular condition is accomplished. It is known as the Open-ended loop. In For loop, we can have more than one initialization or increment/decrement, separated using a comma operator and one condition as well. For loop is used to evaluate the initialization part first, and then it checks the condition for true or false. If the condition is true, then it executes the set of statements of for loop. After that, it evaluates the increment or decrement condition until the condition becomes false, it repeats the same steps. It will exit the loop when the condition is false.

for (initial value; condition; incrementation or decrementation )

There are nested For loops as well in which there is the outer For loop and inner loop. In this nested loop, the inner loop is repeated for the times for a given condition of outer loop iteration.

for(initialization; condition; increment/decrement)

In this, the condition is evaluated before processing the body of the loop. If the condition is true, then only the body of the while loop is executed. Then the control goes back to the beginning after completing the loop once. The statements in the while loop will be executed again, and if the condition is true and checked, then this process goes on until the condition becomes false. If the condition is false, the control will go out of the loop. After completion of the loop, the control will go to the statement that is immediately after the loop, and the body can contain more than one statement. The curly braces are not that important if it contains only one statement. If the condition is not true in the while loop, then loop statements won’t get executed.

It will print the numbers from 1 to 5 like below.

In this loop, the statements in the loop need to be executed at least once. After that, it checks the condition. If the condition is true, then it will again have executed the  loop; otherwise, it will exit the loop. It is known as an exit controlled loop. It is similar to a while loop, and in this, the condition is always executed after the body of the loop. The while loop is executed only when the condition is true, but sometimes the statement needs to be executed at least once, so for that do-while loop has to be used. The difference between while and do-while loop is that in while loop while is written in the beginning and in do-while, the condition is mentioned at the end, and it ends with a semicolon (;).

We will be learning about loops in C programming in this blog post.We will learn how to use loops in C programming, their advantages, all the types of loops and a brief description of each type.

Here is a guide for loops in C: how to make use of them and types of loops

The for loop in C language is used to iterate the statements or a part of the program several times. It is frequently used to traverse the data structures like the array and linked list.

The syntax of for loop in c language is given below:

for(Expression 1; Expression 2; Expression 3){  

Infinite loops can be a series of instructions that can be carried out forever. These types of loop happen whenever there is simply no terminating condition offered or possibly a terminating condition that could never be fulfilled (just like 1==2 and so on.) or maybe occasionally due to a run time error. In the old system, infinite loops triggered the whole system to become irresponsible; however, in modern Operating Systems, these types of loops usually can be ended through the end-user.

The initialization declaration is executed just once.

After that, the conditional expression can be examined. If the test expression is false (0), for loop is ended. However, if the conditional expression is true (nonzero), codes within the body of for loop are performed, and the update expression is updated.

This technique repeats before the test expression can be false.

The for loop is usually applied if the quantity of iterations is well known.

To find out more on conditional expression (once test expression is examined to nonzero (true) and 0 (false))

The most powerful iteration statement, but potentially also a source of bugs. Let’s get the loop variable initialized first.

The loop condition is evaluated if its outcome is true.

If not, execution continues following the for a statement after the body’s executed.

The expression updating the loop variable is executed, and the loop condition is again evaluated and so on, and this continues until the loop terminates. Of course, this loop will not execute its body since the count starts at 10, and this does not satisfy the condition.

It’s easier to see such things at a glance with a for statement. So let’s change the initializer to 0 and take it for a spin, and there’s our count from 0 through 9 as expected.

An interesting thing about for statement is that any one of these may be omitted. We can, for example, use a loop variable declared elsewhere. This is fine and has the same effect.

But now the count variable is visible beyond the for statement, again potentially a source of bugs. You should always try to keep a variable as limited and local as possible. Still, this is legal if you need it. You can also omit the expression by updating the loop variable.

Again, this is fine, but what might be somewhat surprising is that you can even omit the loops condition expression itself.

In that case, the condition is assumed to be true, and the loop will remain the same, so loop indefinitely or until you terminate it in some other way.

Here again, we are using the break statement. We first introduced with a switch statement.

It can also be used to break out of the loop statement and causes execution to commence following the loop. This works just as well with a while statement, by the way. This now is again equivalent to the original while statement and the original for statement with three parts of the for statement neatly in line.

The main difference is that the loop condition is not actually checked upfront, although we know visually that the condition will hold at least once. The body is then executed, which includes the statement updating the loop variable and the if statement evaluating the loop condition manually.

Let’s give it a try. And sure enough, 0 through 9 again.

The primary statements are provided by the C programming language for selection and iteration.

We considered the if statement the most widely used statement for selection or control flow.

If some condition expression is true, then the associated statement or compound statement is executed. If not, execution continues at the next statement, if any.

For statement gives you a lot of control over iteration in a more condensed syntax. There is nothing you cannot write with a while loop, but it is more convenient and safe in many cases since you can include a declaration which the other statements cannot, at least in C.

The significance of loops in the different programming languages is enormous; they will enable us to minimize the number of lines within a program, producing our program more understandable and as well, effective.

Using a for loop in C, we will learn about its function, its flowchart, and examples in this blog post.

For loop in C:how to work with it and some simple examples

I'm working with a code base where each time a routine is run, it creates a new schema in MySQL with identical structure.

What I'm looking to do is to iterate over all schemas and run a query on a given table in that schema. Ideally, it would also print out the name of the schema on each result line.

I can't figure out a way that doesn't involve building a heady sproc to do this.

loops

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For loop in C:how to work with it and some simple examples

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loops

Trending Blogposts on loops

Ruby retry

Here is a guide for loops in C: how to make use of them and types of loops

For loop in C:how to work with it and some simple examples

Popular Discussions on loops

openIterate query over all schemas?

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