having problem with a C code

i having a problem with the following code, it's though a simple code but i am not able to understand the output given by it

#include<stdio.h>
int main()
{
     float a=0.7;

     if(a<0.700000)
          printf("Hi%f\n",a);
    else
          printf("Hello \n");
}

on compilling the above code the if statement gets true and prints "Hi", but according to me it shoul print "Hello". the condition is falls if i use "a>0.7" in if statement.

plz tell me what's the reason behind it.