This question already has an answer here:
- 'float' vs. 'double' precision 6 answers
- Is floating point math broken? 30 answers
I recently found this C code online.
#include <stdio.h>
int main() {
double x = 3.1;
float y = 3.1;
if(x==y)
printf("yes");
else
printf("No");
}
The output is No.
I added a few more printf calls to investigate
#include <stdio.h>
int main() {
double x = 3.1;
float y = 3.1;
if(x==y)
printf("yes");
else
printf("No");
printf("%.10f\n", y);
printf("%.10f\n", x);
return 0;
}
The output came as
3.0999999046
3.1000000000
Why is it so? Why has the float variable lost its precision when printed to 10 decimal places?
