Question

Possible Duplicate:
Floating point comparison

When I run the code below I get the following output:

Output : if

Why does this happen?

#include <stdio.h>

void main()
{
    float a = 0.7;
    if(a<0.7)
    {
        printf("if");
    }
    else
    {
        printf("Else");
    }
}

Answer 1

Floating points are not stored in precise format. Most likely, your platform interprets

float a = 0.7;

as

float a = 0.69999....;

This is because of the internal representation of floating points on your platform. The link provided by Daniel should get you started.