Do-While Loop in C++.

C++ do...while Loop

• The do...while loop is a variant of the while loop with one important difference. 
• The body of do...while loop is executed once before the test expression is checked.

The syntax of do..while loops.

do 
{
// codes;
}

while (testExpression);

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How do...while loop works?

• The codes inside the body of loop is executed at least once. Then, only the test expression is checked.
• If the test expression is true, the body of loop is executed. This process continues until the test expression becomes false.
• When the test expression is false, do...while loop is terminated.

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Flowchart of do...while Loop

Do-While in C++.

Example 2: C++ do...while Loop

// C++ program to add numbers until user enters 0

#include <iostream.h>

int main() 

{

    float number, sum = 0.0; 

    do 

    {

        cout<<"Enter a number: ";

        cin>>number;

        sum += number;

    }

    while(number != 0.0);

    cout<<"Total sum = "<<sum;  

    return 0;

}

Expected Output:-

Enter a number: 2

Enter a number: 3

Enter a number: -4

Enter a number: 4

Enter a number: 2

Enter a number: 2

Enter a number: 4.4

Enter a number: 0