View Compilation Error

0_0_28834489_18571.cpp: In function 'int main()':
0_0_28834489_18571.cpp:8:37: error: 'calloc' was not declared in this scope
         A=(int*)calloc(sizeof(int),n);
                                     ^
0_0_28834489_18571.cpp:46:15: error: 'free' was not declared in this scope
         free(A);
               ^