DO WHILE LOOP

#include <stdio.h>
int main ()
{    
 int a = 10;    /* local variable definition */
 do     /* do loop execution */
 {
  printf("value of a: %d\n", a);  /* at 1st printing the RAW */
  a = a + 1;   /* incrementing */
 }while( a < 20 );   /* at last checking the condition */

 return 0;
}

output :
value of a: 10
value of a: 11
value of a: 12
value of a: 13
value of a: 14
value of a: 15
value of a: 16
value of a: 17
value of a: 18
value of a: 19