View Compilation Error

0_0_19085468_12695.cpp: In function 'int main()':
0_0_19085468_12695.cpp:12:5: error: 'Elements' was not declared in this scope
     Elements *pt1=(Elements *)malloc(sizeof(Elements)*num);
     ^
0_0_19085468_12695.cpp:12:15: error: 'pt1' was not declared in this scope
     Elements *pt1=(Elements *)malloc(sizeof(Elements)*num);
               ^
0_0_19085468_12695.cpp:12:30: error: expected primary-expression before ')' token
     Elements *pt1=(Elements *)malloc(sizeof(Elements)*num);
                              ^
0_0_19085468_12695.cpp:13:15: error: 'pt2' was not declared in this scope
     Elements *pt2=(Elements *)malloc(sizeof(Elements)*num);
               ^
0_0_19085468_12695.cpp:13:30: error: expected primary-expression before ')' token
     Elements *pt2=(Elements *)malloc(sizeof(Elements)*num);
                              ^