what are default integer values?

Question

I read somewhere that default floating point values like 1.2 are double not float.
So what are default integer values like 6

Answer 1

There are three types of integer literals(or integer constants in the standards terminology): decimal, octal or hex and the rule are slightly different for your specific example 6 would be int but in general for decimal constants without a suffix(u, U, l, L, ll, LL) it will be based on which type can represent the value which is covered in the draft C99 standard section 6.4.4.1 Integer constants paragraph 5 which says:

The type of an integer literal is the first of the corresponding list in which its value can be represented.

so for a decimal literal without a suffix the types would be the first of:

• int
• long int
• long long int

and for octal and hex the types would be the first of:

• int
• unsigned int
• long int
• unsigned long int
• long long int
• unsigned long long int