Segmentation fault

1:

int main(void)
{
 char *ExamChar = "1234";
 char haha[20];

 printf("haha 1\n");
 *(haha) = 0x10;
 printf("haha 2\n");
 *ExamChar = 0x20;
 printf("haha 3\n");
 return 0;
}

可以看出*ExamChar = 0x20; 此時會造成問題