View Compilation Error

0_0_17042817_27786.cpp: In function 'int main()':
0_0_17042817_27786.cpp:29:28: error: 'strcmp' was not declared in this scope
             if(strcmp(a,"-")==0||strcmp(a,".")==0)
                            ^
0_0_17042817_27786.cpp:54:24: error: 'strcmp' was not declared in this scope
         if(strcmp(a,".")==0)
                        ^