ANSI-C: maximum number of characters printing a decimal int

Question

I\'d like to know if it is an easy way of determining the maximum number of characters to print a decimal int.

I know contains

Answer 1

Here's the C version:

#include 

#define xstr(s) str(s)
#define str(s) #s
#define INT_STR_MAX sizeof(xstr(INT_MAX))

char buffer[INT_STR_MAX];

Then:

$ gcc -E -o str.cpp str.c
$ grep buffer str.cpp
char buffer[sizeof("2147483647")];

$ gcc -S -o str.S str.c
$ grep buffer str.S
    .comm   buffer,11,1