Last updated on:May 26th, 2018,

Do While loop Cplusplus

What is do while loop?

Do while loop have the following properties;

  • Conditional loop structure
  • Executes the statements until the given condition remains true. Stop the loop when given condition false.
  • Similar to while loop.
  • Body of loop must be executed at least once whether given condition is True or False.
    • If the given condition is True then loop can execute multiple times.

What is the syntax of do while loop?

Syntax
do

{

body of loop;

statements;

}

While (condition);

Example:

1

2

3

4

5

6

7

8

9

10

11

 

 

#include<iostream>

using namespace std;

int main()

{

int number=1;

do

{

cout<<“number is “<<number<<endl;

number++;

}

while(number<=10);

cout<<“you are outside the loop”;

}           

 

Output:
number is 1

number is 2

number is 3

number is 4

number is 5

number is 6

number is 7

number is 8

number is 9

number is 10

you are outside the loop

Line 5:

  • Integer type loop variable “number” is declared and initialized with value 1.

Line 6 to 10:

  • Set of instructions for execution.
  • Loop increment / Loop decrement

Line 11:

  • There is a condition that loop will execute if value of number variable is less than or equal to 10.

 

Test Your Understandings
1. If the given condition is false then no statement execute in do section? YES / NO
Answer - Click Here:
NO, at least one statement executes even condition false
do

{

cout<<“number is “<<number<<endl;

}

while(number<=10)

2. What is the error in code above?

Answer - Click Here:
Error: while(number<=10)

Correct: while(number<=10);

 

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