Determining sprintf buffer size - what's the standard?

Question

When converting an int like so:

char a[256];
sprintf(a, \"%d\", 132);

what\'s the best way to determine how large a should be? I a

Answer 1

Its good that you are worried about buffer size. To apply that thought in code, I would use snprintf

snprintf( a, 256, "%d", 132 );

or

snprintf( a, sizeof( a ), "%d", 132 );  // when a is array, not pointer