Про sizeof

[type_Oleg]

#include <stdio.h>

int main(int argc, char **argv)
{	
	printf(" %d\n",sizeof('x'));
	printf(" %d\n",sizeof("x"));
	printf(" %d\n",sizeof("xx"));
	printf(" %d\n",sizeof(char));
	return 0;
}

Все понятно, кроме вывода первой строки. Почему sizeof от символа x аж 4 байта.

[p51x]

Потому что это С. А по стандарту С 6.4.4.4:10

An integer character constant has type int. The value of an integer character constant
containing a single character that maps to a single-byte execution character is the
numerical value of the representation of the mapped character interpreted as an integer

Т.е. 'x' - это int

[type_Oleg]

Спасибо.