Loops in flow graphs

Take source code as shown below,

a = 0;
b = b+c;
c = 0;
If (a>d)
{
c = b;
b++;
}
else
{
c = d;
d++;
}
a= b+d;

Basic blocks in above source code are

(1)(2)(3)(4)
a = 0;
b = b+c;
c = 0;
If (a>d)
c = b;
b++;
c = d;
d++;
a= b+d;

Flow graph for above Basic blocks