Float data type in c

See more:

C

My doubt is :
we write

float a = 25.33f;

which is of course a normal way of initializing a float variable...

now we can also do the same thing in this way

float a = 25.33;

now my doubt is whether their is a difference between the above two statements as far as i know both are going to perform the same thing but in the first statement their is 'f' written at the end of 25.33 so what does that 'f' indicate i know it indicates that the data stored will be of floating type but the second statement also means the same so why do we write 'f' at the end of any float number

i tried this piece of code

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

Output of the above program is c. Why? so
i googled it i found that 0.7 is a constant and the float 0.7 is rounded to 0.699999988 how it is rounded to 0.699999988 and in case of 0.8
a=0.800000011 and
constant 0.8 is 0.8000000000000000 whats the actual logic behind that, please if anyone can help me out i would be thankful

Thanks & Regards
Radix :rose: