EXIT CONTROL LOOP IN C

We often utilize an exit control loop in C to examine the termination condition for an exit. Control would leave the main body of the loop if the evaluation for the termination condition yielded a true result. Otherwise, the control makes another entry inside the loop.

This kind of loop often deals with the loop's exit control statement.

DO WHILE LOOP:

The most applicable illustration of an exit control loop is the do-while loop.
The while loop has been modified to become the do-while loop.
The do-while loop is the most appropriate loop when it is necessary to run the program and do certain activities at least once.
The do-while loop cannot be executed again if the evaluation of the termination condition or test expression returns false.
Since the do-while loop analyzes the termination condition at the conclusion, it is the most important exit control loop and will therefore initially execute unconditionally for the first time.
The do-while loop will probably be ended if the examination of the termination condition for the exit loop yields true.
If this doesn't happen, it will be put into practise once more.

Syntax:

The do-while loop's syntax is provided below:

do
{
    // main body of the do-while loop 
} 
while (termination condition/ test expression);
while (termination condition/ test expression);

The following list highlights the key differences between the while loop and the do-while loop:

Do-while loop:

An exit control loop is the do-while loop.
The termination condition/test expression is assessed at exit in the do-while loop.
The usage of the semicolon, which designates the end of the do-while loop, at the conclusion of the termination condition in the do-while loop is a requirement.

Syntax:

do
{
// loop body
} while(condition);

Example:

do
{
printf("\n%d",i);
i++;
} while(i<=6) ;

While loop:

An entrance control loop is the while loop.
The while loop evaluates the test expression and termination condition as soon as it enters the loop.
The while loop does not require anything to be executed after the termination condition.

Syntax:

while(condition)
{
// loop body
}

Example:

while(i<=6)
{
printf("\n%d",i);
i++;
}

The use of the do-while loop can be better understood by using the following C program. Using addition, subtraction, multiplication, and division as examples, this program shows how to do basic arithmetic operations.

// program starts
#include <stdio.h> // standard program line for input and output
#include <conio.h> // libraries
void main()
{
    float x, y, answer; // declaration of float datatype variables
    int choice; // naming variables with the int datatype
    do
    {
printf("\n 1.Addition \n 2.Subtraction \n 3.Multiplication \n 4.Division \n 5.Exit");
      // by giving the user an increasing number of options
printf("\n Enter Your Choice: "); // using the user's input
scanf("%d", &choice); // putting a user-entered value into a variable
if(choice!= 5)
    {
printf("\n Enter X : " ); // using the user's input
scanf("%f", &x); // putting a user-entered value into a variable
printf("\n Enter Y : " ); // using the user's input
scanf("%f", &y); // putting a user-entered value into a variable
    }
    switch(choice)
    {
        case 1: // addition case
               answer = x + y; // basic operations in addition 
printf("\n the addition of %f and %f is : %f", x, y, answer); 
               //answer will be in float datatype
               break;
        case 2: // subtraction case
               answer = x - y; // basic operations in substraction
printf("\n the subtraction of %f and %f is : %f", x, y, answer);
                //answer will be in float datatype
               break;
        case 3: // multiplication case
               answer = x * y; // basic operations in multiplication
printf("\n the multiplication of %f and %f is : %f", x, y, answer);
                //answer will be in float datatype
               break;
        case 4: // division case
               answer = x / y; // basic operations in division
printf("\n the division of %f and %f is : %f", x, y, answer);
                //answer will be in float datatype
                break;
        case 5:
exit(0); // exit operation
        default: // program line to handle user-input errors
printf("\n sorry, you have entered the invalid input!!!"); 
    }
getch();
 } while(choice!= 5);
}

Output:

1.Addition 
 2.Subtraction 
 3.Multiplication 
 4.Division 
 5.Exit
 Enter Your Choice: 3

 Enter X : 5

 Enter Y : 6

 the multiplication of 5.000000 and 6.000000 is : 30.000000
 1.Addition 
 2.Subtraction 
 3.Multiplication 
 4.Division 
 5.Exit
 Enter Your Choice:

Conclusion:

In conclusion, the exit control loop is a crucial component of the C programming language and offers a quick and effective approach to manage loop execution.

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