View Compilation Error

0_0_33881924_14886.cpp: In function 'int cmp(Node, Node)':
0_0_33881924_14886.cpp:13:30: error: 'strcmp' was not declared in this scope
     if(strcmp(x.space,y.space))
                              ^
0_0_33881924_14886.cpp:15:32: error: 'strcmp' was not declared in this scope
     return strcmp(x.name,y.name)<0;
                                ^
0_0_33881924_14886.cpp: In function 'int main()':
0_0_33881924_14886.cpp:31:29: error: 'strcpy' was not declared in this scope
         strcpy(di,f[0].space);
                             ^
0_0_33881924_14886.cpp:35:36: error: 'strcmp' was not declared in this scope
             if(strcmp(di,f[i].space))
                                    ^
0_0_33881924_14886.cpp:42:37: error: 'strcmp' was not declared in this scope
             if(!strcmp(di,f[i].space))
                                     ^