Here the c program and op is below :      
file : loops.c
#include<stdio.h>
   int main() {
   int a = 1;  //defining variable
   do{
   a = a + 2;
   }
   while(a < 5);  //looping encounters
   print f("%d", a);  // printing the value of a
   }
 output:
 5
To be explain that : 

The output to be expected is 3 4 ,but it showing the output is 5 can anyone explain this simple
code on c programming and the control flow of this program and how it works.