How it gets "zero".. after 3.14

Question

#include <stdio.h>
int main() {
const double PI = 3.14;
printf("%f", PI);
return 0;
}

Answer 1

If you don't want the zeroes then use "%.2lf" as format specifier
.2 defines 2 digits fraction
lf defines double type
More on this topic you can read from here 👇
http://www.cplusplus.com/reference/cstdio/scanf/
http://www.cplusplus.com/reference/cstdio/printf/