While Loop Program in C

While Loop in C Language with Definitions, Syntax, Flow Charts, and Examples will be covered in this article. Please read our earlier articles, where we covered C Language problems, The use of loop control statements is crucial for logical programming. Iteration Statements are another name for looping statements. Therefore, the terms "looping" and "iteration" have equivalent meanings. Let’s first grasp what a loop is, why we need one, and the many sorts of loops that may be used in a C program before learning how to use the while loop.

What is looping?

Looping is the process of continually executing a statement or set of statements up until the condition is met. In this instance, the loops’ execution ends when the condition becomes false. Iteration statements are known as loops because of the way they repeat the execution of the statements in a circular pattern.

Why do we need looping?

Code repetition is the loop’s primary goal. When repeats are necessary during implementation, looping should be used instead of repeatedly writing the same statements.
Looping or iterating Statements:
Loops are produced by iteration statements in a program. Iteration is the process of repeatedly running the same piece of code until a predetermined condition is met. The same instructions are carried out by iteration statements up until a termination condition is satisfied. The iteration statements loop in C is as follows:

  • while loop
  • for loop
  • do-while loop

What is While Loop in C Language:

As long as the condition is true, a loop simply repeats a block of instructions. As long as the stated condition is true, it will repeat whatever many times it wants to. The loop will stop running if the condition is met.
While loops are employed to continually execute statements up until a specified condition returns false. A single remark or a group of statements are both acceptable in this context. Any expression that meets the criterion is true, and a nonzero value does too. While the condition is true, the loop iterates. You can understand the while loop more clearly if you view the syntax and flowchart side by side.

While Loop Syntax in C Language:

Following is the syntax to use the while loop in C Programming Language.

When using a while loop, we must first verify the condition. If the condition is true, control will move inside the body of the loop, if the condition is false, the control will move outside the loop.

When using an iteration statement, the control is returned to the condition after the body has been executed until the condition becomes false. An endless loop will result if the condition is true.

The flow is distinct from the if condition, although it is comparable to the if condition, just condition, and statements. The flowchart enables us to comprehend how it differs.

Flow Chart of While Loop in C Language:
The following diagram shows the flow chart of the while loop.

The flowchart will begin. The oval sign denotes the beginning. The condition will then be checked. Every condition, as was previously explained, has two outputs: true and false. We must determine if the predictions of what will occur are correct or untrue.

All statements defined inside the block (inside the while loop block) will be executed if the condition is true. Will it come to an end when the statements are executed? It won’t end, no. Following the execution of the statements, it will once again go and verify the condition. As long as the specified condition is true, the identical procedure will be repeated. If the assumption is incorrect, the sentence will come to an end. This is how a while loop might operate.

Program to understand While loop in C Language:

#include<stdio.h>
int main()
{
    int a=1;
    while(a<=4)
    {
       printf("%d", a);
       a++;
    }
    return 0;
}

The variable an is given a value of 1 during initialization, and the condition is then verified. If the condition returns true, the statements included in the while loop’s body are carried out; otherwise, control is transferred outside of the loop. The ++ operator is used to increase the value of a before it is once again examined for the loop condition.

Example to Print no 1 to 5 using a while loop in C Language

#include <stdio.h>
int main()
{
    int i = 1;
    while(i <= 5)
    {
        printf("%d ", i);
        i = i + 1;
    }
    return 0;
}

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