return 局部变量

#include <stdio.h>

char *
getStr()
{
        char s[] = "hello";

        return s;    //error: stack data will be invalid after return
}

char *
getStr1()
{
        char *s = "hello";

        return s;    //ok: s is on .data area
}

char *
getStr2()
{
        static char s[] = "hello";

        return s;   //ok： s is on .data area too
}

int
main(void)
{
        printf(getStr());
        printf(getStr1());
        printf(getStr2());

        printf("\n");

        return 0;
}