c++ 字符串常量

<span style="font-size:18px;">char str1[] = "abc";
char str2[] = "abc";
const char str3[] = "abc";
const char str4[] = "abc";
const char *str5 = "abc";
const char *str6 = "abc";
char *str7 = "abc";
char *str8 = "abc";
cout << ( str1 == str2 ) << endl;
cout << ( str3 == str4 ) << endl;
cout << ( str5 == str6 ) << endl;
cout << ( str7 == str8 ) << endl;</span>

而str5,str6,str7,str8是指针，它们指向同样的常量区域。

#include <stdio.h>
char *returnStr()
{
 char *p="hello world!";
 return p;
}
int main()
{
 char *str=NULL;//一定要初始化，好习惯
 str=returnStr();
 printf("%s\n", str);
 
 return 0;
}

#include <stdio.h>
char *returnStr()
{
 char p[]="hello world!";
 return p;
}
int main()
{
 char *str=NULL;//一定要初始化，好习惯
 str=returnStr();
 printf("%s\n", str);
 
 return 0;
}

#include <stdio.h>
char *returnStr()
{
 	static char p[]="hello world!"; //存放在静态存储区
 	return p;
}
int main()
{
 	char *str=NULL;
 	str=returnStr();
	 printf("%s\n", str);
 	return 0;
}