While loop checks the input condition first and exits if the condition fails. Do-while loop enters the loop for the first time by default and executes the statements inside the loop before checking the condition. This nature of do-while loop is essential for making a menu driven program where we need to show a list of options to the user and wait for the userís input. The following example shows a menu driven program using do-while loop.
int main(int argc, char *argv)
printf("Add an user [a]\n");
printf("Delete an user [d]\n");
printf("View user's record [v]\n");
printf("Modify user's record [m]\n");
printf("Press ESC to exit\n:");
key = getch();
}while(key != 27);
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