Question

Possible Duplicate:
Floating point comparison

#include<stdio.h>
#include<conio.h>
int main()
{
float i=0.7;
clrscr();
if(i < 0.7)
     printf("If Block");
else
     printf("Else Block");
getch();
return 0;
}

I dont understand whay the output will be “If block”…..please help why the if part is executed?

Answer 1

Actually i is 0.69999999998 in it’s floating representation.

When you assign i=0.7 in memory 0.7 cannot be represented in double precision as you would have thought.

So the comparison between float and double leads to type promotion and in that case i is less than 0.7 which is double.