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I know some difference between char* and char[].
char x[] = "xxxx"
Is an array of chars;
char *y = "xxxx"
is a pointer to the literal (const) string;
And x[4]=='\0', and *(y+4) == '\0' too.
So why sizeof(x)==5 and sizeof(y)==4?
The sizeof an array type is the size the array takes up. Same as
sizeof("xxxx").The sizeof a pointer type is the size the pointer itself takes up. Same as
sizeof(char*).