Storage for string constants

strconst.c

#include <stdio.h>

int main(void)
{
	char a[] = "Always writable";
	char *b = "Likely not writable";
	const char c[] = "Never writable";

	char *x = "xyz";
	char *y = "xyz";

	if (x == y) {
		printf("String constants are shared\n");
	} else {
		printf("String constants are not shared\n");
	}

	a[7] = 'W'; // Okay
	b[7] = 'N'; // Runtime error if string is allocated in read-only memory
	c[7] = 'R'; // Compile-time error
	
	return 0;
}

C: A Reference Manual, 5th Edition, Sec. 2.7 Constants, pp. 33-34