1 #include"string.h" 2 #include"malloc.h" 3  4  5 void swap(int a,int b) 6 { 7     int temp; 8     temp=a; 9     a=b;10     b=temp;11 }12 13 int get_int(int a)14 {15     int i=1+a;16     return i;17 }18 19 char* get_memory0()20 {21     char* p=(char*)malloc(sizeof(char)*20);22     strcpy(p,"hello world");23     return p;24 }25 26 char* get_memory1()27 {28     char* p="hello world";29     return p;30 }31 char* get_memory2()32 {33     char p[]="hello world";34     return p;35 }36 37 void main()38 {39     int x=4,y=3;40     swap(x,y);41     int z=x-y;42     printf("z=%d\n",z);//问题143 44     z=get_int(z);45     printf("z=%d\n",z);//问题246 47     char* c0 = get_memory0();48     printf("c0=%s\n",c0);//问题349 50     const char* c1=get_memory1();51     printf("c1=%s\n",c1);//问题452 53     char* const c2=get_memory2();54     printf("c2=%s\n",c2);//问题555 56     c1=c2;                //657     *c1=*c2;            //758     c2=c1;                //859     *c2=c1;                //960 }