View Compilation Error

0_0_13655458_4390.cpp: In function 'void insert(char*)':
0_0_13655458_4390.cpp:22:55: error: 'malloc' was not declared in this scope
             p->next[*q-'a']=(node*)malloc(sizeof(node));
                                                       ^
0_0_13655458_4390.cpp: In function 'int main()':
0_0_13655458_4390.cpp:92:33: error: 'malloc' was not declared in this scope
     h=(node*)malloc(sizeof(node));
                                 ^