View Compilation Error

0_0_32557378_1279.cpp: In function 'int main()':
0_0_32557378_1279.cpp:9:15: error: 'swap' was not declared in this scope
    swap(&a, &b);
               ^
0_0_32557378_1279.cpp:12:15: error: 'swap' was not declared in this scope
    swap(&b, &c);
               ^
0_0_32557378_1279.cpp:15:15: error: 'swap' was not declared in this scope
    swap(&a, &b);
               ^
0_0_32557378_1279.cpp:17:30: error: 'print' was not declared in this scope
   print("%c %c %c\n", a, b, c)
                              ^