View Compilation Error

0_0_21682362_14026.cpp: In function 'int main()':
0_0_21682362_14026.cpp:28:31: error: 'strtol' was not declared in this scope
     lc = strtol(buffer,NULL,16);
                               ^
0_0_21682362_14026.cpp:37:21: error: 'gcvt' was not declared in this scope
     gcvt(dc,6,buffer);
                     ^