c - strcpy function with pointers to character array -

in code below result stack overflow. though null character there both strings, strcpy loop should terminate source string has null character. why stack overflow occurs??

#include <stdio.h> #include<strings.h> int main(void) {     char *str="hello world";     char *str1="good morning";     strcpy(str,str1);     printf("%s",str);     return 0; } 

the error isn't stack overflow, modifying string literal.

str pointer points string literal "hello world", , modifying string literal undefined behavior.

change str to:

char str[100] = "hello world";