This is very similar to the while loop except that the test occurs at the end of the loop body. This guarantees that the loop is executed at least once before continuing. The test then verifies the data, and loops back to read again if it was unacceptable.

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The do while Loop

This is very similar to the while loop except that the test occurs at the end of the loop body. This guarantees that the loop is executed at least once before continuing.

Such a setup is frequently used where data is to be read. The test then verifies the data, and loops back to read again if it was unacceptable.

do
{
printf("Enter 1 for yes, 0 for no :");
scanf("%d", &input_value);

} while (input_value != 1 && input_value != 0)

To better understand the do while loop let us see the following example:

#include <stdio.h>

int main()
{
int i;

i = 0;
do
{
printf("The value of i is now %d\n", i);
i = i + 1;
} while (i < 5);

return 0;
}

The result of the program is displayed as follows:

The value of i is now 0
The value of i is now 1
The value of i is now 2
The value of i is now 3
The value of i is now 4

Sample Chapters from book DATA RECOVERY WITH AND WITHOUT PROGRAMMING by Author Tarun Tyagi
Data Recovery with & without Programming


Publishers of the Book
Number of Pages
ISBN
Price of the Book


BPB Publications, New Delhi, India
540
81-7656-922-4
$69.00 (Including Shipping Charges, Cost of Book and Other expenses, Free Source Code CD included with the Book)





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