Question

When I write:

if ((1/3) > 0) ...

Will I need to cast one of the operands to (float) to make this condition true? Or what is the default variable-type C is using?

And if I would write:

if ((1.0/3) > 0) ...

Has the situation now changed, because the compiler notices one of the operands has to be float?

Answer 1

In absence of suffixes, sufficiently small numbers have int or double types

a = 42; /* 42 has type int */
b = 42.0; /* 42.0 has type double */

You can use suffixes to specify the type of the literal

c = 42U; /* unsigned int */
d = 42.0f; /* float */
e = 42.0L; /* long double */
f = 42ULL; /* unsigned long long (in C99; C89 didn't have long long) */