View Compilation Error

0_0_13802578_18700.cpp: In function 'int find(char*)':
0_0_13802578_18700.cpp:53:22: error: 'strcmp' was not declared in this scope
   if(strcmp(str,ss[i])==0)
                      ^
0_0_13802578_18700.cpp: In function 'int main()':
0_0_13802578_18700.cpp:128:23: error: 'strlen' was not declared in this scope
    len[i]=strlen(ss[i]);
                       ^