C programming Language Do-while loop

What is the usage of the do-while  loop in C? you can understanding after reading this article .

generally in programming languages, looping statements used in programming language to executes of block of code until the perticular condition is satisfied.

• for loop
• while loop
• do-while loop

do{

statement(s);

}

while(condition);

 

Flow diagram – do-while loop

The do-while loop is similar to while loop but one main difference between while and do-while loop. The do-while loop is executed only once time before checking the condition part. So you will understand the do-while loop is executed at least once. 

Ex

program 1

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int i=1;
    do{
         printf(“%i”,i);
          i++;
    }
    while(i<=10);


    //printf(“Hello world!n”);
    return 0;

}

In the program, test expression returns true codes inside the loop body are executes until become condition is false, so output here  

Te program displays natural numbars 1 to given number

 

Program 2

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int i=1;
    do{
         printf(“%in”,i);
          i++;
    }
    while(i>=10);

    return 0;
}

When the above code is executed, it produces the following result

  when the code is executed test expression returns false  codes inside the body is executed only once

#include <iostream>
#include <conio.h>
using namespace std;

int main()
{
     int sum=0;
    int n;
    cout << "Enter the number as you wish" << endl;
    cin>>n;
   int i=1;
   do{
    sum=sum+i;
    i++;
   }while(i<=n);
   cout<<"The sum of 1 to "<<n<<" : "<<sum;
   getch();
    return 0;
}