Character Pointers and Functions.c

What will be the output of the following C code?

Question 1:

//   Date:2020/4/3
//   Author:xiezhg5
#include <stdio.h>
#include <string.h>
int main(void)
{
	char*str="hello, world\n";
	char strc[]="good moring\n";
	strcpy(strc,str);
	printf("%s\n",strc);
	return 0;
}

//  hello, world

Question 2:

//   Date:2020/4/3
//   Author:xiezhg5
#include <stdio.h>
#include <string.h>
int main(void)
{
	char str[]="hello, world\n";
	str[5]='.';
	printf("%s\n",str);
	return 0;
}

//  hello. world

Question 3:

//   Date:2020/4/3
//   Author:xiezhg5
#include <stdio.h>
#include <string.h>
int main(void)
{
	char *str="hello world";
	char strary[]="hello world";
	printf("%d %d\n",sizeof(str),sizeof(strary));
	return 0;
}

//  4(32位系统) 12

Question 4:

//   Date:2020/4/3
//   Author:xiezhg5
#include <stdio.h>
#include <string.h>
int main(void)
{
	char *str="hello world";
	char strary[]="hello world";
	printf("%d %d\n",strlen(str),strlen(strary));
	return 0;
}

//  11 11

Question 5:

//   Date:2020/4/3
//   Author:xiezhg5
#include <stdio.h>
#include <string.h>
void f(char *k)
{
	k++;
	k[2]='m';
	printf("%c\n",*k);
}
int main(void)
{
	char s[]="hello";
	f(s);
	return 0;
}

//  e

Question 6:

//   Date:2020/4/3
//   Author:xiezhg5
#include <stdio.h>
#include <string.h>
void f(char *k)
{
	printf("%s\n",k);
}
int main(void)
{
	char s[]="hello";
	f(s);
	return 0;
}

//  hello