[SOLVED] why this result when using if :: c

tushar_pandey · 08-21-2012, 10:41 PM

Code:

float a = .7 ;

if ( .7 > a )
{
    printf("yes");
}
else
{
    printf("no");
}

why output is :: Yes

NevemTeve · 08-21-2012, 10:52 PM

The floating-point numbers aren't accurate when storing fractions. Plus, float values are less accurate than double values. Conclusions:

1. Don't use type float.
2. Be careful when working with floating-point values. Eg:

Code:

wrong: if (x==0.1) ...
good:  if (fabs(x-0.1)<1e-9) ...

piyush.sharma · 08-22-2012, 12:33 AM

Code:

float a=.7;
(.7f>a)?printf("Yes\n"):printf("No\n");

by default .7 is stored as double that are accurate upto 14 decimal points, but float is accurate upto 6 decimal place only,
so .7(double) > a(float) /* Result is yes */
and .7f(float) > a(float) /* Result is no because both are equal now */