Description of why floating point numbers may lose precision in Visual C++

Sample Code

   /* Compile options needed: none
      Value of c is printed with a decimal point precision of 10 and
      6 (printf rounded value by default) to show the difference
   */ 

   #include <stdio.h>
   #define EPSILON 0.0001   // Define your own tolerance.
   #define FLOAT_EQ(x,v) (((v - EPSILON) < x) && (x <( v + EPSILON)))

   void main()
   {
    float a,b,c
    a=1.345f;
    b=1.123f;
    c=a+b;

   //if (FLOAT_EQ(c, 2.468))        // Remove comment for correct result.

    if (c == 2.468)                 //Comment this line for correct result.
     printf("They are equal\n");
    else
     printf("They are not equal!!The value of c is %13.10f,or %f",c,c);
   }
				

The Output Result